Justin Timberlake Cheating On his girl Jessica Biel

Justin Timberlake has been spotted cosying up to his 'Alpha Dog co-star Amanda Seyfried. The 'SexyBack' singer and 22-year-old 'Mean Girls' actress Amanda enjoyed a drink together at New York's Pink Elephant club last week. 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. In August, it was reported the couple were planning to move in together, but while Jessica wanted Justin to move into her Los Angeles home so they could be close to the sea, he wanted to relocate to New York.