The 27-year-old 'Wrestler' star and Moennig attended the Hammer Museum's annual Gala in the Garden in Los Angeles and the two acted like a couple during the event, reported New York Post online.
"Evan Rachel Wood arrived with Kate Moennig. They were holding hands and looked very much like a couple... (They) kept close all night," a source said.
Wood came out as bisexual in 2012, just before she wed British actor Jamie Bell.