JBiel072208_01_X17.jpgJessica Biel JBiel072208_001_X17.jpg Just when you thought Jessica Biel might finally be lightening up around the photogs - she leaves her smile at home!

We caught the booty queen out walking her dog yesterday with a decidedly dour expression on her face. Aww - why so glum, Jessica? A girl who's dating Justin Timberlake ought to have plenty to smile about!