The on-again/off-again couple - who recently reconciled even though 23-year-old Chris is still on probation for abusing the 'Diamonds' singer in 2009 - attended their first public event together where they were spotted hugging and kissing.
A source told HollywoodLife.com that 24-year-old Rihanna took a break from recording her new album 'Unapologetic' - which is set to be released next month - to join the 'Turn Up The Music' singer at his Qubeey launch party at Playhouse nightclub in Beverly Hills, California on Saturday night.
The Qubeey Channel is Chris's new customised online channel that will enable his fans - whom he calls ''Team Breezy'' - to get more exclusive access to the singer's life through photos, videos and personalised messages.
The couple were also spotted enjoying drinks and sharing a cigarette together at the event before leaving separately.
Friends say Rihanna is happier and more focused on her work since they got back together.
A source: ''I know it's a lot easier for her to concentrate and work hard now that Chris is back in her life.
''She don't worry about the bulls**t no more. She don't wonder about what he's doing or who he's with. It's like she feels more secure and confident when he's in her life.''