Heidi Montag & Lauren Conrad
"You know what you did!" was the iconic shout heard round the reality TV world. "The Hills" co-stars can trace their feud back to when Montag started dating her now-husband Spencer Pratt. When rumors started flying that Conrad had a sex tape floating around, she blamed Pratt and Montag for starting them.
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Dwayne Johnson & Tyrese
It all started when Tyrese Gibson called out Dwayne Johson when the release date for Fast and Furious 9 was pushed back. Allegedly, the film was pushed back a year, and Gibson threatened to quit a Fast spinoff if Johnson was involved in it. The two have yet to talk in person, but Gibson says that a conversation regarding their creative differences will certainly happen.