Jared Leto Hot for Scarlett?

There's nothing wrong with a little innocent flirting  — or is there? Jared Leto certainly didn't seem to think so at Sunday night's Golden Globes bash at the Sunset Tower Hotel in West Hollywood, where he made a quick bee-line for his newly married ex-girlfriend Scarlett Johansson!

A fellow party-goer tells OK! that Leto, "spent most of the evening hitting on Scarlett Johansson, who certainly didn't seem to mind."

Interestingly, Leto's other ex, Cameron Diaz, was also at the party, but the insider tells OK! he "wanted nothing to do" with the Charlie's Angels star. Instead, the source says Cam, who was there solo, was happy chatting up the tall, dark and handsome Gerard Butler!

Johansson dated Leto prior to meeting longtime boyfriend Josh Hartnett. The two broke up in 2004 and the actress went on to date and marry Ryan Reynolds in a private ceremony in Canada.