02/09/2009 at 01:00 AM EST
Most women would do anything to look like Jessica Simpson
did in her Daisy Dukes (below, in 2005). To the singing star, however, a hot body places a distant second to a happy heart. "I don't really worry about [my weight] that much when I'm happy," she told PEOPLE last year. And since she started dating Dallas Cowboys quarterback Tony Romo, 28, in November 2007, Simpson, 28, has had plenty to smile about. "She's happier than ever," a source tells PEOPLE. Of course, having a boyfriend who loves your body helps. As Simpson herself told PEOPLE: "He would never say, 'I think you need to lose some weight.' If he did, I wouldn't be dating him!"
MARRIAGE TO NICK LACHEY
IN TROUBLE 2005
AFTER BREAKUP WITH JOHN MAYER 2007
DATING TONY ROMO 2008