While the maybe-lovebirds were both in Park City, Utah, promoting their new drama The Words...
There was no major PDA happening at the Acura Studio soiree, according to a fellow party-goer. In fact, they arrived and left separately, according to our source.
After Cooper and his mom (yes, his mom!) took off, the Star Trek beauty stuck around and continued to hit the dance floor with her equally as gorgeous sister Cisely.
In other star sightings news...
Kendra Wilkinson-Baskett and hubby Hank enjoyed date night at Westlake Village Inn's Mediterraneo restaurant in L.A.
Preggers Molly Sims showed off her baby bump while grabbing a bite to eat with three girlfriends at West Hollywood eatery Fig & Olive.
Modern Family's Sarah Hyland and boyfriend Matt Prokop, along with Mark Ballas and Derek Hough, took in a performance by JoJo at the Living Room at the W Hotel in Hollywood.
Melissa Leo got pampered with some Laboratoire Dr. Renaud spa treatments at the TMG/Pandora Jewelry Luxury Suite at the Sundance Film Festival.