Jessica Biel has been left red-faced after the publication of a photograph showing a girlfriend grabbing her bottom while boyfriend Justin Timberlake's back was turned. Biel and Timberlake were at the Lambeau Field stadium in Green Bay, Wisconsin on 7 October (07), an hour before American football team the Green Bay Packers took on the Chicago Bears. And while pop superstar Timberlake was facing the opposite direction, the couple's female friend copped a feel of Biel's behind - and a picture of the moment has been published in American magazine Star. An onlooker tells the publication, "It looked like the friend reached over and squeezed Jessica's butt while Justin was looking out at the field. "Jessica didn't even flinch - but when Justin suddenly turned around, Jessica's friend pulled her hand away."