In new photos posted on Celebuzz, Facinelli, 38, is seen holding hands with actress Jaimie Alexander, 28, who has appeared on his show Nurse Jackie.
The pair were snapped on Thursday at N.Y.C.’s Penny Farthing having a dinner date. That same evening, they attended The Cinema Society screening of his film Breaking Dawn: Part 2.
“She came to the screening a little earlier than him,” a source tells PEOPLE. “He arrived with the cast and they took a photo with Ashley Greene. They seemed like they were in a really great mood. She stayed near him at the screening.”
The festive evening continued with an after-party for the film – in which Facinelli plays Dr. Carlisle Cullen – at Finale.
“Jaimie was at the party all night,” an event-goer tells PEOPLE. “They came together, but did the red carpet separately. And then both of them stayed close by one another at the party. Peter also had [some of] his family with him.”
Facinelli and Alexander, who were “hanging out with friends and drinking,” each left shortly after midnight.
Facinelli’s rep had no comment.