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Leonardo DiCaprio, Rihanna

Jordan Strauss/Invision/AP, Pascal Le Segretain/amfAR14/WireImage

Rihanna celebrated her 27th birthday with a slew of fellow celebrities but there was one Hollywood hottie who got most of her attention.

The R&B star was spotted packing on the PDA with Leonardo DiCaprio, 40. The two have hung out at least twice before in recent weeks, fuelling romance rumors. They have not commented about their dating lives.

At her birthday party, held at a private residence in the Hollywood Hills on Friday, RiRi, dressed in a slinky, cleavage-baring sparkling silver dress, and Leo were seen kissing, touching and dancing with each other, a source told E! News on Saturday.

Another source told E! News on Saturday that Rihanna and DiCaprio have been hooking up, but that they are just having fun and that their relationship is not serious.

The two were first linked romantically in January. They were spotted flirting with each other at a friend's birthday bash at the Playboy Mansion. At the time, a source had told E! News that they were "just friends." Days later, Rihanna and DiCaprio reunited and appeared cozy at another birthday party, for Kings Of Leon musician Caleb Followill, at a West Hollywood hotel.

The list of celebrities who attended Rihanna's birthday party on Friday includes Beyoncé and Jay Z, supermodel and Empire actress Naomi Campbell, Def Jam co-founder Russell Simmons, models Angela Martini and Alicia Rountree and Sir Mick Jagger, who was spotted on the dance floor.

Rountree posted on her Instagram page a photo of herself with thelegendary Rolling Stones frontman, saying, "Learning dance moves from a Pro."

She also shared a video of Rihanna blowing out the candles on her three-tier birthday cake.

Beautiful RiRi ?? #happybirthday ???? @badgalriri #rihanna #LA

A video posted by Alicia Rountree (@aliciarountree) on

Fellow attendee Tommy Alastra, a producer, posted on his Instagram page a pic of Rihanna near the cake, holding a drink.

Happy birthday @badgalriri #aquarius ??????

A photo posted by Tommy Alastra (@talastra) on

Richie Akiva, a New York club owner and a friend of DiCaprio, also posted pics of the singer at the bash.

What a night!!!! Birthday Bash?? #riribdayparty #epic HAPPY BORN DAY @badgalriri

A photo posted by Richie Akiva (@richie_akiva) on

Happy Birthday! #badass #sweethearted #feb20

A photo posted by Richie Akiva (@richie_akiva) on

Martini shared a group selfie.

Last night celebrating @badgalriri #bday with @aliciarountree @uncle_rush @mickjagger #LA

A photo posted by Angela Martini (@angela_martini) on

But the best selfie of the night comes courtesy of guests Paris Hilton and sister Nicky Hilton.

A photo posted by Paris Hilton (@parishilton) on

"Nobody throws a party like @BadGalRiRi!" Paris said. "Last night was epic! Happy Birthday beautiful!"

—Reporting by Sara Kitnick