Alexander Skarsgard and Margot Robbie, the stars of the upcoming Tarzan movie, have sparked rumors of a budding romance at the Sundance Film Festival.

Alexander Skarsgard, Margot Robbie Dating?

At the Park City, Utah film festival, Skarsgard, 38, and Robbie, 24, have been spending much of their free time partying together.

On Friday, Robbie was “holding court with an entourage” that included Chris Pine and Chiewetel Ejiofor at the Sabra Hummus Kick-Off Party when Skarsgard showed up, an insider told People magazine.

“They came separately but left together in a big group,” the source added. “Alex told the girl at the door he was coming to see his ‘friend.’ They asked who his friend was and he said Margot Robbie … he came to see her.”

Check Out Alexander Skarsgard’s uBio HERE

Upon leaving that party, Skarsgard and Robbie turned up at the 1OAK pop-up sponsored by Tinder and VOICO. “They arrived together and sat together,” a fellow party goer noted. “And the couches there are not big at all.”

“”They were all over each other,” another source told Us Weekly, claiming the acting pair was making out by the DJ booth.

The last stop of the night for the partying costars was at TAO.