Rihanna and Leonardo DiCaprio sparked dating rumors as they were apparently seen making out over the weekend.

TMZ reported designer Nikki Erwin had boyfriend Chuck Pacheco, who produced "The Hangover" and "Alpha Dog," invite DiCaprio to her 30th birthday party at the Playboy Mansion on Saturday night. Celebrities like Paris Hilton, Naomi Campbell, Tobey Maguire, Pamela Anderson, Tom Hardy and Hilary Duff attended as well.

The "Wolf of Wall Street" actor was "getting hot and heavy" with the "Diamonds" hitmaker at the star-studded event with two eyewitnesses claiming that the pair was kissing.

Moreover, RiRi seemingly has a major crush on DiCaprio, according to HollywoodLife.com.

"He's funny. He's real, honest and authentic," a source said. "He holds a good conversation but the one thing that makes her weak every time she looks at him are his eyes. That alone makes her knees tremble.

"She loves looking into his eyes and when they talk, she gets lost in those baby blues of his," the source added.

The "Stay" singer has reportedly set her eyes on the "Titanic" star.

"Leonardo and Rihanna are getting very close, and she just adores him," a source revealed to Dish Nation. "So much so that word among her friends is that she has her sights set on him becoming her boyfriend.

"Rihanna is no shrinking violet, and unlike many of Leo's model girlfriends, she's got 'a lot of game' to keep him on his toes," the source said. "They have been together at parties and even spent time along at friends' holiday apartments in St. Barths."

The source added that seeing Rihanna and Leonardo DiCaprio together in the public soon is a possibility: "Rihanna needs a date for Awards season -- and what better man to take than Leo."