Joe Scarnici/Getty Images for J/P Haitian Relief Organization
Dylan Penn and Steven R. McQueen have called it quits.
"I think it just fizzled," the source said.
The two were first spotted together in November having dinner in Los Angeles with Penn's dad and Jon Hamm after the premiere of Sean's film, The Secret Life of Walter Mitty. (It was at about the same time, Dylan was seeing Robert Pattinson, but that romance also was short-lived. She told GQ in December that she found rumors of her and the Twilight star "actually kind of funny.")