The birth of a new couple was just one of the exciting happenings at Sundance Film Festival this past weekend. Tarzan co-stars Alexander Skarsgard and Margot Robbie packed on the PDA and spurred rumors that they’re dating.

They attended the 1OAK Sundance party on Friday night and an onlooker saw them kissing while they were standing by the DJ booth. Earlier in the day they attended the Sabra Hummus Kickoff Party together.

“They were all over each other," a source told Us Weekly, with another adding they were "super affectionate all night."

Skarsgard, 38, and Robbie, 24, will appear together in the upcoming David Yates Tarzan remake.

People reports the rumored new couple was with a big group, which included Chris Pine.

On Saturday, Robbie was a no-show at the Art of Elysium Party but the True Blood star was there with his Diary of a Teenage Girl co-star Bel Powley.

Skarsgard has previously dated Kate Bosworth.

image via Roger Wong/INFphoto.com