Amanda Seyfried is topless and nude in 'Alpha Dog' - and Justin Timberlake has been seen getting intimate with his 'Alpha Dog co-star Amanda Seyfried.

The 'SexyBack' singer - who had been dating 'The Illusionist' star Jessica Biel - and 22-year-old 'Mean Girls' actress Amanda enjoyed a drink together at New York's Pink Elephant some time back.

A source told the New York Daily News newspaper: "They met up in the club and left together after just 15 minutes. Amanda's no Jessica Biel, but they seem to enjoy each other's company."

Justin, 26, met Amanda in 2006 when they worked together on indie movie 'Alpha Dog' which follows the story of a teenage drug dealer.

The 'Cry Me A River' singer has been dating Jessica Biel, 25, since February last year.

Nude screen cap from 'Alpha Dog' here. The video can be located here.