Rihanna's rumoured boyfriend, American actor/film producer Leonardo DiCaprio reportedly helped to organise her 27th birthday on 20 February.

According to US Weekly, the Diamonds singer's party was held at a private home in Beverly Hills, California.

"There were balloons that spelled out her name set up," a source said.

Celebrities including Naomi Campbell, Mick Jagger, Beyonce, Jay Z, Russell Simmons, model Angela Martini, Tommy Chiabra and Richie Akiva were present at the Barbadian singer's birthday celebrations.

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Riri's day

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Last night 🎂 happy #Bday @badgalriri #rihanna #LA

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According to People, though Rihanna and the Titanic star did not "act like a couple, they did share a few flirtatious moments" at the party.

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

Rumours that Chris Brown's former girlfriend and DiCaprio are dating started last month and apparently, the two have been spending a lot of time together.

During an interview with Elle, Rihanna revealed her words to live by.

"'Avoid obviousness.' That is a quote by Leonardo DiCaprio. That's what makes you create something, that's the excitement, that's the thrill," she said.

It was previously reported that Rihanna and DiCaprio recently spent Valentine's Day together.