Ashley Olsen and new boyfriend Justin Bartha make their first public appearance

Ashley Olsen and “National Treasure” star Justin Bartha, made their first public appearance together Monday night at the Cinema Society screening of “Trumbo.” The movie about blacklisted Hollywood writer Dalton Trumbo, who penned “Spartacus” and “Roman Holiday.” “They were cozying up together most of the night,” said a NY Post source. Afterwards Olsen and Bartha partied at Tribeca Cinemas with Josh Lucas, Amy Sacco, Kelly Bensimon and her date Maximiliano Palacio, and new lovebirds Joan Allen and Shawn Diamond, who locked lips on the red carpet.  Bartha doesn’t have the best ‘dating’ reputation, though, after a breakup with Lydia Hearst in August 2007 led to a screaming match in front of everyone at the “In Style” party during the Oscars in February 2008.