This has got to be the cutest couple ever! Justin Long and Kate Mara are rumored to be in a "very new relationship" according to a source close to the couple. Justin, who once dated Drew Barrymore and Leighton Meester, has been seen arm in arm with Kate in NYC's East Village. Kate, younger sister to Rooney Mara, took Justin out for his birthday on June 2nd and seems like they had a blast celebrating. They've also been seen watching the hit Broadway show, Jesus Christ Superstar, where they got to meet the cast. Even though Justin has had his fair share of girlfriends, we hope that this relationship with Kate will last. (usmagazine)