Guests who were hoping to film a cat fight were however disappointed as the ladies stayed at opposite ends of the West Hollywood venue.
Rihanna apparently skipped the Grammys ceremony to attend The Young Money Cash Money Records bash at Greystone Manor with her on-again beau Drake.
Brown’s current girlfriend, 25-year-old aspiring model Karrueche, was there alone making the most of things while her singer boyfriend was doing a stint in rehab.
Dark-haired Karrueche hung out at the El Cartel Tequila table where she no doubt attracted gazes her way.
Karrueche cut loose in a very low-cut black jumpsuit that featured a plunging split cleavage and cut-outs at the waist.
The exotic brunette remains supportive of Brown after he was ordered to 90 days of rehab by a judge to deal with anger management issues stemming from his probation case in November.
Karrueche has, in fact, visited Chris at the Malibu treatment facility where he is at over Thanksgiving, Christmas and New Year’s.
Just a year ago, Rihanna and Chris Brown were seen partying at the Supperclub in Los Angeles following the Grammys.
Despite their turbulent past and his run-ins with the law, the couple rekindled their romance in 2012.
Then in May 2013, Brown confirmed he and Rihanna has broken up again.