They recently reconciled their relationship despite the controversy surrounding them, but could things be on the rocks again for Rihanna and Chris Brown?
The Look At Me Now singer celebrated his 24th birthday - which isn't actually until May 5th - at the Emerson nightclub in LA on Friday night, with Rihanna nowhere to be seen.
Former flame Karrueche Tran was in attendance however, sparking rumours that there might be trouble in paradise for the young couple once again.
Stay singer Rihanna is currently in New York for her Diamonds World Tour, and sources have revealed that work commitments are preventing the couple from finding much time to spend together.
A source told HollywoodLife: "It's up and down sometimes, the s**t is even sideways. Everytime some s**t pops off between them, they blast that s**t all over social media, and they shouldn't.
"But when they're far apart, that's how they act out towards each other when one of them doesn't get their own way. It's crazy as f**k, but it's how they get down."
Possibly trying to take his mind off his far-away girlfriend, Chris hit the town to celebrate his upcoming birthday with some famous friends.
The heavily tattooed singer was joined by Christina Milian, David Hasslehoff, Chloe Green and ex-girlfriend Karrueche Tran as he partied the night away.
He kept it casual for the celebration, wearing khaki-coloured chinos and a white T-shirt. He wore an open chequered shirt and completed his look with a pair of black hi-top trainers.
Tran - who was dumped by Brown when he got back with Rihanna last year - showed off her slimline figure as she helped her ex celebrate.
Opting for a LBD, the model accentuated her trim pins by pairing it with a pair of white fringed boots.
Edging the ensemble up, she teamed it with an oversized denim jacket and a bright red clutch bag.
Topshop heiress Chloe Green also attended in a white see-through top and leather trousers.