jessicawilliamrast2.jpg

With an ass like that, are you surprised?

Justin Timberlake jbiel102408_25_X17.jpgTechnically, Jessica was wearing William Rast, JT's brand jeans when we spotted the booty-ful actress leaving an acting class with her brother (who knew he was such a hottie?)

We're just bummed Justin didn't pick her to star with him in his sexy campaign -- now THAT would have been hot!