Celebrities who hate each other

Celebrities often have larger-than-life personalities which clash severely. The media and paparazzi will always be ready to take full advantage of course. And thus, the entertainment news headlines as well as social media channels were able to reveal the following altercations:
Christina Aguilera and Kelly Osbourne: The feud started over name calling and fat shaming, and even though years have passed, there hasn't been much reconciliation.
Mariah Carey and Nicki Minaj: Nicki, who idolised Mariah was enraged by the veteran star's arrogance and condescending attitude on 'American Idol' in 2013.
Taylor Swift and Katy Perry: These once close friends recently made up, but disputed for almost a decade over backup dancers and cryptic remarks made by Taylor, who sometimes personalises her lyrics.
Drake and Chris Brown: At each other's throats for several year after Chris suspected Drake of getting too close to his ex, Rihanna. Naturally, a Twitter based war of words has followed.
Chelsea Handler and Angelina Jolie: Handler is critical of just about everything Angelina Jolie does, and it's hardly surprising considering Handler's close friendship with Jennifer Aniston.
Justin Bieber and Orlando Bloom: Dating each other's exes and showing revealing photos online will hardly ever lead to anything other than brawls and fierce rivalry between two guys.