Mike Pont—FilmMagic
February 22, 2015 9:33 PM EST

Rihanna rang in her 27th birthday on Friday with a slew of A-list pals – including rumored new love interest Leonardo DiCaprio.

The singer celebrated her big day at businessman Jim Goldstein’s famed home in LA. The guest list included DiCaprio, Mick Jagger, Jim Carrey, Bill Murray, Naomi Campbell and Paris Hilton.

Rumors have been circulating that the “Stay” singer and the Wolf of Wall Street star have been casually dating. A source tells PEOPLE that although Rihanna and DiCaprio, 40, didn’t act like a couple, they did share a few flirtatious moments.

“They weren’t couple-y but they would flirt and dance so definitely a little magic there,” says the onlooker. “They were definitely flirty and dancing, but not over the top.”

In true RiRi fashion, the festivities lasted until the early morning (5 a.m. to be exact).

Rihanna also shared an emotional birthday message on Instagram.

“27 years ago, my mother gave birth to her very first child at the tender age of 27,” she wrote “Life is never a piece of birthday cake, but I feel special that I was chosen by my Father in Heaven to make it here! And each year that goes by I am more grateful! Every day we wake up, means we get another chance at life … to live what we’ve learned and to discover even more, to be good to other people and to know that you are a part of their smile! I cherish these days, and I pray that God will spare my life to see many more! #Feb20”

The Barbadian singer has been busy in recent weeks, promoting and performing her newest single, “FourFiveSeconds.”

The acoustic song is a departure from her usual brand of sexy pop, and features appearances by Paul McCartney and Kanye West. The trio performed the song live for the first time at the 2015 Grammy Awards earlier this month.

This article originally appeared on PEOPLE.com

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