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Former Secretary of State Madeleine Albright did not let Conan O'Brien get away with tweeting that he was going as "Slutty Madeleine Albright" for Halloween. She came right back at him with a hilarious response. But sometimes these celeb beefs aren't as lighthearted.

Add Black Keys drummer Patrick Carney, right, to the list of musicians unimpressed with U2's attempt to give away an album on iTunes. Carney told The Seattle Times that he believes the band, fronted by Bono, "devalued their music completely" by offering the new release "Songs of Innocence" as a free download to iTunes subscribers.

Sharon Osbourne is also not a fan of U2's giveaway. The TV personality took the group and Bono to task in September 2014 for releasing a free album via iTunes. She called their music "mediocre" and the group "middle-age political groupies."

Snoop Dogg and Iggy Azalea have been battling in a very public way. After Snoop made fun of Iggy's appearance on social media, the "Fancy" rapper responded with confusion, saying that she didn't understand why Snoop would be "supportive to my face but another way on your Instagram."

It seems Martha Stewart isn't the biggest fan of Gwyneth Paltrow's lifestyle brand, GOOP, but Paltrow isn't bothered. After Stewart commented in an interview that Paltrow "just needs to be quiet" and not try "to be Martha Stewart," Paltrow took it as a compliment. "I'm so psyched that she sees us as competition," the actress said in October.

Danity Kane's reunion is over as quickly as it began. The girl group got back together in 2013 after a four-year hiatus, but by August its bond was broken again because of an alleged dispute between Aubrey O'Day, left, and Dawn Richard. O'Day has claimed Richard punched her in the back of the head without provocation, while Richard says O'Day and another member were cutting her out of the group.

On August 1, Donald Trump protested via Twitter about two American Ebola patients returning to the United States. Whoopi Goldberg responded on her show that while Trump is her friend, "that was a stupid comment. Do your homework, Donald. Just do your homework."

A recent TMZ video appeared to show actor Orlando Bloom and pop singer Justin Bieber having an altercation at a bar in Ibiza, Spain, but neither star has commented on the report. That hasn't stopped the world from imagining that these two had a heated throwdown.

Kim Kardashian didn't mention actress Adrienne Bailon by name when she went on a Twitter rant July 29, but it was pretty obvious whom she was speaking of. Bailon, who used to date Kim's brother Rob, spoke ill of the past relationship in a magazine interview. Kim then tweeted, "Funny how she says being with a Kardashian hurt her career yet the only reason she has this article is bc she is talking about a Kardashian ... So sad when people try to kick my brother when he is down #FamilyForever."

Freddie Prinze Jr. worked with Kiefer Sutherland on the Fox series "24" in 2010 and said his experience with the actor was so horrible, he wanted to quit acting. Yet while Prinze called Sutherland "the most unprofessional dude in the world," Sutherland responded via his rep that he enjoyed working with his former co-star.

Rappers Nicki Minaj and Iggy Azalea were thought to have beef after Minaj made a pointed statement at the BET Awards about writing her own rhymes. Some took that as a not-so-subtle jab at Azalea, but both rappers have tried to squash rumors of a feud.

When Angela Bassett was asked about casting Whitney Houston's daughter, Bobbi Kristina Brown, in the biopic she's directing about the late singer, Bassett responded that she never thought to do it for several reasons, "one being that (Brown's) not an actress." Bobbi Kristina did not take kindly to the comment and tweeted some disparaging words about the actress.

Rihanna's bare-it-all style is catching flak from the ladies of TLC. "Every time that I see you, you don't have to be naked," T-Boz said during a recent interview with an Australian media outlet. "We became the biggest-selling girl group of all time with our clothes on." Rihanna's response? A series of pointed subtweets and a new Twitter header that shows a topless TLC.

Charlie Sheen is also unhappy with Rihanna. Sheen tweeted that the singer declined to meet him and his gal pal when they all landed at the same restaurant in May. The actor went on a bit of a Twitter rant, saying, "it was a pleasure NOT meeting you." We think Rihanna might have responded when she tweeted, "If that old queen don't get ha diapers out of a bunch..."

Katy Perry got a tongue-lashing from Miley Cyrus after she dissed the younger singer's hygiene on an Australian morning show March 4. The two have appeared to reconcile -- on Twitter, of course.

An argument on the set of "In Living Color" has apparently put Rosie Perez and Jennifer Lopez at odds for the past 20 years. As Perez alleges in a new memoir, Lopez "went off (like) some ghetto biatch, screaming and pounding her chest" while they were working together on the show. Perez claims Lopez made "disparaging comments" about her even after leaving the show.

Drake was the subject of a glowing profile in a February issue of Rolling Stone, but one quote had the Canadian rapper seeing red. The magazine claimed Drake was critical of Kanye West's album "Yeezus," which Drake said never happened. To add insult to injury, Rolling Stone took the cover from Drake at "the last minute," the rapper tweeted. "I'm disgusted with that. RIP to Phillip Seymour Hoffman. All respect due. But the press is evil," he said on February 12. In the end, Drake wound up deleting his comments and apologizing.

The Jonas Brothers may still be family, but the trio could no longer take being bandmates. A rep for the group told CNN on October 10 that there is "a deep rift within the band. There was a big a disagreement over their music direction."

The beef between Lady Gaga and Kelly Osbourne dates back to an open letter Gaga wrote, accusing Kelly of being a bully. When Kelly O. saw that Gaga had offered her a birthday cake on October 27, she tweeted, "Not to be ungrateful but why would you send me a birthday cake via my MOTHER in a country half the (world) away? ... #EatMyS***."

Kanye West has given Jimmy Kimmel the rap feud he's always wanted. After Kimmel poked fun at West's interview with the BBC -- in which the entertainer called himself the No. 1 rock star on the planet -- West went to Twitter to air his profane grievances (in all caps, of course). The two later made amends with a televised sitdown.

Rapper Kendrick Lamar not only set Twitter on fire with his guest verses on Big Sean's song "Control," he also stoked the flames of a bit of a hip-hop beef. Lamar called out his fellow lyricists to step up their game, which irritated some and led to rapper Joell Ortiz recording a rebuttal.

After her heart attack in 2012, Rosie O'Donnell received support from an unlikely source: Donald Trump. The two engaged in a pretty high-profile feud in the past, with her calling him a "snake-oil salesman" and Trump retorting that she was a "loser."

Onetime friends Denise Richards and Heather Locklear hit a major impasse after the former started dating the latter's ex, Bon Jovi's Richie Sambora. In interviews, Richards denied that she and Locklear were still friends at the time she began seeing Sambora.

As a teen star, Hilary Duff reportedly dated heartthrob Aaron Carter before he broke up with her to get with Lindsay Lohan -- and then he tossed Lohan aside to win back Duff. The actress told People magazine in 2007 that she and Lohan had made peace.

Yeah, we couldn't believe it either. MC Hammer reportedly took offense to Jay-Z guest-rapping in a Kanye West song ("So Appalled") that "Hammer went broke so you know I'm more focused/I lost 30 mill so I spent another 30/Cuz unlike Hammer 30 mill can't hurt me." Hammer took it to where all celebs take their beefs now -- Twitter -- and released a diss track, "Better Run Run."

Kanye West and Taylor Swift had one of the greatest celeb feuds of all time. The rapper famously grabbed the singer's mic at the 2009 MTV Video Music Awards. He later apologized, and she seemed to accept his apology via her song "Innocent."

It appears that rapper Lil' Kim has not taken too kindly to what she views as Nicki Minaj's lack of respect and similar style with the colored wigs and sexually explicit lyrics. The pair have traded insults all over the media.

It's a case of he said/she said/he said. Eminem set it off after he claimed to have had a torrid dating relationship with singer Mariah Carey, who denied it. Her husband, Nick Cannon, even offered to defend her honor by meeting the rapper in the ring.

Nicole Richie and Paris Hilton helped to coin the term "frenemies" after their very public bust-up in 2004. The former "Simple Life" co-stars went on to make up two years later.

Oprah Winfrey was reportedly annoyed by David Letterman's constant joking references to her name when he hosted the Academy Awards in 1995. The late-night talk-show host told "The Daily Show's" Jon Stewart he had also once played a practical joke on Winfrey, convincing a waiter that she had agreed to pick up his tab. They have since made peace.

Gossip blogger Perez Hilton claimed Will.i.am and his security guards attacked him at an awards show over some unkind words he had written about the musician's Black Eyed Peas bandmate Fergie. Will.i.am denied he had anything to do with it.

Tom Cruise got on Brooke Shields' bad side by decrying her use of medication to treat postpartum depression. Shields responded with an op-ed in The New York Times, and Cruise later apologized for his remarks.

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(CNN) -- You got served, Conan O'Brien.

The late night talk show host discovered that diplomats have a way with words when he tweeted Thursday, "I picked out my Halloween costume. I'm going as 'Slutty Madeleine Albright.' "

The former secretary of state responded with a bit of her own humor: ".@ConanOBrien I'm considering going as hunky Conan O'Brien - but that might be too far fetched."

Burn!

The tweet seemed to tickle O'Brien, who came back with ".@Madeleine YES - My first twitter war with a former Secretary of State! You're next, George P. Shultz!"

Albright, who in the Clinton administration in 1997 became the first woman to serve as secretary of state, offered the funnyman 90 characters of wisdom: ".@ConanOBrien Never get into a word war with a diplomat. We talk even more than comedians."

The sparring ended with O'Brien tweeting, "Damn - Whenever I go toe to toe with @Madeleine Albright, she always wins."

Indeed.