They starred as lovers in the video for Justin's What Goes Around…Comes Around in 2006. Now they are said to have enjoyed a drink together at New York club Kenmare before sneaking off to his New York loft apartment earlier this week.
A source told The Sun, 'They were very touchy feely and sat close to one another in a VIP booth along with a few other pals.
'They hardly looked at their mates when they went to dance because they were so into one another.
'Contact seemed very natural to the both of them.'
According to the report, they left the club 10 minutes apart but Scarlett was spotted leaving his apartment at 10am on Wednesday, wearing the same clothes from the night before.
Scarlett recently split with Sean Penn and announced her divorce from Ryan Reynolds last December, while Justin and Jessica Biel ended their four-year relationship in March.