Rihanna's birthday was "carnage," as she and her friends drank four bottles of tequila.
The 'You Da One' singer held a wild party to celebrate turning 24 on Monday at a $13,000 penthouse suite in London's Corinthia hotel on Sunday night.
A source told the Daily Mirror newspaper: "Rihanna's birthday was carnage. She and her posse of female pals, who had flown in from the U.S., stripped down to their bikinis and ended up dancing around in a full bath of water.
"They were downing shots and went through four bottles of Patron tequila.
"A massive birthday cake was presented to Rihanna and the room was filled with red roses."
All the partying left the pop star in a worse for wear state for rehearsals for the BRIT Awards - which take place at London's The 02 arena Tuesday night - wearing shorts, stockings and suspenders, dark glasses, a baseball-style jacket and a dark scarf, although to help her get back in shape she had a personal chef to cook her breakfast. She also had her own private dining room filled with purple flowers, candles and Oreo cookies.
And it seems Rihanna was feeling the after-effects during rehearsals.
A source told the MailOnline: "Rihanna turned up to rehearsals really, really late.
"She didn't do any singing or dancing whatsoever. She literally stood on the stage like a zombie.
"She made all of her dancers, about 50 of them, dance around her and she stood there looking like she'd been dug up."
