Margaret Cho vs. Tilda Swinton
After Swinton came under fire for her role as The Ancient One in "Doctor Strange," Margaret Cho revealed that the actress came to her seeking an explanation as to why the movie was being criticized for whitewashing the role. Cho said the exchange made her feel like "a house Asian," leading Swinton to release the entire email exchange.

Also Read: Margaret Cho ‘Felt Like a House Asian’ After ‘Doctor Strange’ Whitewashing Talk With Tilda Swinton

Camila Cabello vs. Fifth Harmony
Fans of the girl group Fifth Harmony were shocked when the group announced on Twitter that they had been informed through Cabello's manager that she would be leaving the group to focus on her solo career. This led to public a back-and-forth between the two parties over how exactly the split went down.

Also Read: Fifth Harmony Takes Fans Inside Drama With Camila Cabello

Lady Gaga vs. Madonna
Madonna had previously accused Lady Gaga of ripping off "Express Yourself" in her 2011 single "Born This Way," and the feud between the pop stars was reignited in 2016 when Gaga said in a Beats 1 interview that "[Madonna]’s a nice lady, and she’s had a fantastic huge career ... [but] what I do is different. I’m not just rehearsing over and over again to put on a show."

Also Read: Lady Gaga Says She’s Not Like Madonna: ‘I Write All My Own Music’ (Video)

Noah Galvin vs. Colton Haynes

"The Real O'Neals" star Noah Galvin first came out swinging with an unfiltered interview in which he called Haynes' coming out "f—ing p—y bullshit," which the former "Arrow" star later said was "absolutely uncalled for." Swift criticism led Galvin to issue an apology just a few hours later.

Dwayne Johnson vs. Vin Diesel

Dwayne "The Rock" Johnson went off on some of his male "Fast 8" co-stars on Instagram, calling them "candy asses" and unprofessional, leading TMZ to report that he was referring to co-star and producer Vin Diesel.

Calvin Harris vs. Taylor Swift

Harris and Swift's split seemed amicable at first, but then reports began to surface claiming that Swift ghostwrote his summer hit, "This Is What You Came For." Harris clearly believed Swift's reps were behind the leak, tweeting that it was a "hurtful" attempt by her and her team to make him look bad following their break-up. 

Also Read: Calvin Harris Calls Out Taylor Swift Over Songwriting Drama

Kim Kardashian vs. Taylor Swift

The drama over Kanye West's Taylor Swift name-dropping single "Famous" came to a head when Kim Kardashian shared video on Snapchat of Swift approving the controversial lyrics prior to their release. Swift then responded on Twitter and Instagram with a note defending herself.

Also Read: Taylor Swift Rips Kanye, Kim for Leaked ‘Famous’ Lyrics Convo (Video)

Chloe Grace Moretz vs. Khloe Kardashian

Chloe Grace Moretz, a frequent critic of the Kardashians, came to Taylor Swift's defense in the "Famous" debacle, leading Khloe Kardashian to respond with a mocking tweet featuring a NSFW photo of a young woman on the beach, whom she believed to be Moretz. 

Also Read: Chloe Grace Moretz Shames Online Trolls for Hurling ‘Fat,’ ‘Masculine’ Insults

Chrissy Teigen vs. Piers Morgan

Chrissy Teigen and Piers Morgan have frequently engaged in Twitter battles, including the time Teigen called the Daily Mail columnist a "piece of s--- a--hole" after he criticized a Huffington Post column by "Friends" star Jennifer Aniston blasting tabloid media.

Also Read: Jennifer Aniston Op-Ed Outcry: Chrissy Teigen, Anna Paquin Rip Piers Morgan’s Criticism

Ross Mathews vs. Billy Eichner

"Difficult People" star Billy Eichner accused TV personality Ross Mathews of ripping off his show "Billy on the Street" for a commercial, leading to a prolonged Twitter feud, which ended in Mathews calling Eichner a "d---."

Also Read: Ross Mathews Calls Billy Eichner ‘Pompous and Wrong’ After Twitter Feud

Skai Jackson vs. Azealia Banks

Disney Channel star Skai Jackson won praise from social media when she shut down Twitter troll Azealia Banks by telling the rapper to "simmer down a little" after one of her many race-focused rants.

Kanye West vs. Wiz Khalifa

Wiz Khalifa took aim at West on Twitter when the latter announced that his album would be titled "Waves" (it later became "The Life of Pablo"). West didn't take kindly to the jab, ripping into Khalifa with a string of tweets attacking his music, his clothing and even his kids.

Also read: Kanye West Aims Twitter Fury at Wiz Khalifa: ‘I Own Your Child’

Linda Perry vs. Lady Gaga/Diane Warren

When the song "Til It Happens to You" from "The Hunting Ground" soundtrack received an Oscar nomination, songwriter Linda Perry accused Lady Gaga of taking a songwriting credit she didn't deserve. Perry later publicly apologized for the tweets after Gaga's co-writer, Diane Warren, came to the pop star's defense.

Also read: Linda Perry Apologizes to Lady Gaga for Oscars Jab: ‘I Made a Mistake to Comment’

Piers Morgan vs. Susan Sarandon

Upset about Susan Sarandon's choice of wardrobe to introduce the In Memoriam tribute at the SAG Awards, Piers Morgan took to Twitter to call her outfit "horribly inappropriate." Sarandon simply responded with a photo of herself in a bra from "The Rocky Horror Picture Show," dedicated to Morgan.

Also read: Susan Sarandon Says Piers Morgan Is ‘Milking’ #CleavageGate (Video)

Demi Lovato vs. Taylor Swift

A bevy of stars came out in defense of Kesha in her dispute with Sony and music producer Dr. Luke, but Demi Lovato wasn't satisfied by Taylor Swift's choice to donate money to help cover the singer's legal fees. "Take something to Capitol Hill or actually speak out about something and then I'll be impressed," she wrote.

Kanye West vs. Deadmau5

When house music producer Deadmau5 came after Kanye West on Twitter, the "Life of Pablo" rapper fired back with his typical string of angry tweets. "Do you do birthday parties?? My daughter loves Minnie mouse," West wrote, referencing the mask the producer wears on stage.

Also read: Kanye West Fires Back at Deadmau5 After DJ Slammed Rapper for Using Piracy Sites

Sam Smith vs. Dustin Lance Black

Sam Smith stuck his foot in his mouth after winning an Oscar for his James Bond theme "Writing's on the Wall," mistakenly suggesting that he might be the first openly gay man to win an Academy Award. "Milk" screenwriter and openly gay Oscar winner Dustin Lance Black called him out on Twitter, suggesting that the singer familiarize himself with his work.

Also read: Dustin Lance Black Wants Sam Smith to ‘Stop Texting’ His Fiance

Kim Kardashian vs. Bette Midler/Chloe Grace Moretz/Miley Cyrus

When Kim Kardashian shared a nude selfie, Bette Midler wrote on Twitter that "if Kim wants us to see a part of her we’ve never seen, she’s gonna have to swallow the camera.” Kim's sassy response didn't stop a slew of other celebrities from adding their own two cents, including Chloe Grace Moretz accusing the reality star of being a bad role model and Miley Cyrus accusing them all of being "tacky."