Rumor has it that Rihanna hooked up with Rob Kardashian in London earlier this week. According to Mediatakeout.com, Rihanna and Rob were “all over each other” at the London nightclub Mahiki. After a “heavy” make out session, the two left the club together alone. Rihanna is in town for the BRIT Awards. In other news, according to The UK Mirror, Rihanna and her girls partied hard on her 24th birthday on Monday (February 20th). A source said, “Rihanna’s birthday was carnage. She and her posse of female pals, who had flown in from the US, 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.”At Rihanna’s BRIT rehearsals earlier this week, Rihanna was given a private dining room filled with purple flowers, candles, Oreo cookies and crisps. She also had her own private chef to make a huge breakfast for her and her crew.