The pair became friends after filming the video for Justin's hit, What Goes Around Comes Around together in 2006. Apparently they danced the night away after arriving together at New York club 1Oak at 3.30am on Thursday. But a source told Life & Style magazine that it was all innocent as JT is back with Jessica Biel.
'They were dancing and talking to each other all night like old friends,' an eyewitness said. 'People were surprised that she showed up with him, but they both seemed happy to see each other. He was all smiles with her.
'Scarlett and Justin left together with two of his friends around 5am and hopped into a black SUV.
'You can tell the two are great friends and had a blast together. Scarlett seemed really into him, but he didn't seem interested because of Jessica Biel. It was like he just considers it a friendship.'