Lorde and Diplo. DJ/music producer Diplo made a joke at singer Taylor Swift's expense, tweeting, "Someone should make a kickstarter to get taylor swift a booty." Swift's friend and fellow singer Lorde wasn't pleased, messaging Diplo with:"should we do something about your tiny penis while we're at it hm".
Snoop Dogg and Iggy Azalea. The social media back-and-forth between the two rappers started Sunday when Snoop posted a meme and titled it, "Iggy Azalea No Make Up." Iggy posted some not-so-fancy tweets in response to the Instagram insult. It escalated from there, with Snoop calling her the b-word and asking her to "cool out" because he was only kidding. In another Instagram post, he cranked it up a notch, threatening her. Iggy shot back. "If I'm a (b-word) for asking why you are supportive to my face but another way on your Instagram then so be it," one tweet said. Snoop responded with more expletives. Iggy followed with some retweets from supportive fans. She then posted: "Ima be the bigger man in this situation and leave it be."
Orlando Bloom and Justin Bieber. The "Lord of the Rings" actor reportedly tried to punch the pop star after a run-in at a Spanish nightclub in July 2014. A source told the New York Post's Page Six column the incident began after Bloom declined a handshake when Bieber walked by. Bieber retaliated for the perceived disrespect by saying "something rude to Orlando, like, 'She was good,'" the Post source said. "She" could have been a reference to Bloom's ex-wife, model Miranda Kerr. Bieber was photographed talking with Kerr in October 2012 -- a year before her marriage to Bloom ended. Kerr has denied hooking up with Bieber. Rumors swirled that Bloom was seeing Bieber's off-and-on girlfriend, Selena Gomez, after the two were photographed at a comedy show in April. After the clash, Bieber fanned the flames by posting a photo of Kerr on Instagram and deleting it minutes later. He also posted a photo on Instagram of Bloom wiping his eye, as if he were crying.
Jim Carrey and Shia LaBeouf. While presenting at the 2014 Golden Globe Awards, Carrey took a shot at LaBeouf's recent admission that he had plagiarized one of author Daniel Clowes' graphic novels for his short film. LaBeouf then took to Twitter to post his response: "At least I don't get arrested for indecency on major LA highways! Or abandon love child's," he wrote. LaBeouf later apologized.
Miley Cyrus and Sinead O'Connor. In an interview with Rolling Stone, Miley compared her "Wrecking Ball" video to Sinead's "Nothing Compares 2 U." The Irish singer then responded with an open letter. Cyrus responded and O'Connor penned a second letter warning the young singer, "Taking me on is even more f*&kin' stupid than behaving like a prostitute and calling it feminism."
Kanye West and Jimmy Kimmel. The rapper launched a Twitter tirade against the late-night host after Kimmel poked fun at his BBC Radio interview on his show with a kid-Kanye spoof interview. Among Kanye's tweets: "Jimmy Kimmel is out of line to try and spoof in any way the first piece of honest media in years." It only got worse from there.
Former "American Idol" judge Nicki Minaj unleashed a tirade against fellow co-star Mariah Carey in October 2012, ultimately threatening to punch the singer out after the two new judges disagreed over a contestant's performance.
Anderson Cooper and Star Jones. Cooper said he wasn’t happy with the way Jones reacted to his announcement in which he declared publicly for the first time that he is gay and called her hypocritical. “I seem to recall her hawking her wedding every single day to get free products when she was on 'The View' and I seem to recall her lying about her gastric bypass surgery and making everybody else lie about it as well,” he said.
Amanda Bynes and Lindsay Lohan. The former Nickelodeon star had her car impounded by police after she was pulled over on a suspended license in the summer of 2012, but Lohan, who served 14 days in jail in 2010 after violating her probation in her own 2007 DUI case, thought Bynes got let off a little too easy. "Why did I get put in jail and a Nickelodeon star has had NO punishment(s) so far?" Lohan tweeted on Sept. 16, 2012.
Jon Hamm and Kim Kardashian. The 'Mad Men' star, who has called the reality TV star a "f---ing idiot," made yet another mention at the brunette bombshell's expense in 2012. "The sexy thing is so ephemeral and meaningless other than in the world of selling magazines," Hamm told a British magazine. "Who cares, when it's reduced to just that? You might as well be a Kardashian and have a sex tape."
Star Jones and NeNe Leakes. After stating on "Ellen" that she and Jones "are OK right now," Leakes went on to dish some harsh criticism. "I don't think she's easy to get along with," the reality star began, starting off mildly. "She's a tough girl." Then Leakes added about Jones, "She is bossy; she is manipulative, conniving. And I'm not even being funny. I think that is real. I honestly think that is who she is."
Joy Behar and Snooki. The "Jersey Shore" ultimately apologized for her scathing parody of the talk show maven. Appearing on "The Wendy Williams Show," Snooki explained that a video -- in which she pretended to be Behar and made derogatory comments -- was intended to be a joke. "Everyone took it too seriously, so I took the video down," she said. Behar agreed to make her own peace. 'I found the apology quite sobering,' she admitted, "although maybe that's not the right word."
Bristol Palin and Keith Olbermann. Olbermann called her "the worst person in the world" on MSNBC for her position on abstinence, prompting the "Dancing With the Stars" alum to post a letter to the MSNBC host on her page to defend her position as an abstinence advocate, despite having a baby as a teen. "What Mr. Olbermann lacks in originality he makes up for with insincere incredulity."
Shia LaBeouf and Frankie Muniz. During a radio show interview, LaBeouf hurled an insult at Frankie Muniz's way, reigniting a yearslong feud between the young actors. The "Wall Street 2" star deflected the credit for his box office success, saying, "While that's flattering, you could have put Frankie Muniz into any of the movies I've been in and those movies still would've still been No. 1." Muniz responded on Twitter. "Dear Shia Labeouf. It's getting creepy the fact that you can't stop talking about me. It's been 12 years now. I don't know you. Thanks," he tweeted.
Naomi Campbell and Mia Farrow. The actress contradicted Campbell's claim at the war crimes trial of former Liberian President Charles Taylor that she had no idea who gave her a bag of "dirty-looking pebbles" that turned out to be blood diamonds. Farrow said she and Campbell met Taylor at a 1997 reception in South Africa hosted by Nelson Mandela. Campbell said she didn't know who Taylor was when she met him at the reception.
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