Rihanna's Surprise Birthday Party Star Studded! Leonardo DiCaprio Helps Organize 'FourFiveSeconds' Singer's Soiree

The surprise birthday party for Rihanna was a star-studded affair, with the help of the "FourFiveSeconds" singer's rumored boyfriend, and party-organizer extraordinaire, Leonardo DiCaprio.

In an article from People, Rihanna's birthday party was held at the mansion of Jim Goldstein and some of the A-list personalities who were there, aside from Leonardo DiCaprio, were Beyonce and Jay Z, Bill Murray, Mick Jagger, Jim Carrey, Russell Simmons, Paris Hilton and Naomi Campbell.

An insider said that Rihanna and rumored boyfriend Leonardo DiCaprio didn't "act like a couple," although there were moments that they would "flirt" with each other. The party lasted until 5 a.m.

"They weren't couple-y but they would flirt and dance so definitely a little magic there. They were definitely flirty and dancing, but not over the top," the source said.

Rihanna took to Instagram to post a long message for her birthday: "27 years ago, my mother gave birth to her very first child at the tender age of 27! 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."

Meanwhile, Celebuzz reported that Richie Akiva was also there. The club boss is rumored to be competing with Leonardo DiCaprio for the "FourFiveSeconds" singer.

"Her two "love interests" (according to various sources and media outlets) Leonardo DiCaprio and Richia Akiva, were both celebrating with the beauty on Friday night," it said about Rihanna. "And although it's too soon to tell, DiCaprio might only be the wingman rather than the love interest."