Rihanna was noticeably absent from the Grammy Awards on Sunday, reportedly skipping the event to attend YMCMB's party at Greystone Manor. Also in the house was Karrueche Tran, who was happily partying with friends while her boyfriend Chris Brown is in rehab.

Despite earlier reports that Karrueche was turned away from clubs because Rihanna was inside, the two ladies are said to have stayed on opposite sides of the club without any drama breaking out. Rihanna is said to have hung out with Drake for most of the night, as they drank and popped bottles with friends. 

Source: bossip.com