Jessica Simpson Man Eating Watch

From a Jackass to a one-hit album wonder, pop diva Jessica Simspon has reportedly been keeping her body in top shape with steamy work outs, Celebrity Weekly, Star Magazine reports.

Dim lighting, a plush booth in the back and a tipsy Jessica Simpson downing vodka tonics as she cozies up to a hunky, dark-haired crooner. But on the night of Sept. 4, 2004, at the Whiskey Bar at L.A.'s Sunset Marquis Hotel and Villas, the studly singer that Jessica, 25, cozied up to was not her husband, Nick Lachey! Jessica was caught canoodling with Maroon 5's Adam Levine! "It was obvious that Jessica and Adam were very attracted to each other," an eyewitness who partied with the pair that night tells Star. "They were cuddled right up against each other, side by side, giggling and whispering romantically into each other's ears. Jessica was putting her hand on Adam's leg from time to time."

Jessica has been linked in reports to her Dukes of Hazzard co-star Johnny Knoxville, as well as his bad-boy Jackass buddy and skateboard star Bam Margera. But Jessica's latest boytoy may be Trace Ayala, 25, Justin Timberlake's business partner in the William Rast clothing line, who she's been spotted cozying up to in L.A. since mid-November.

A rep for Simpson insists that Ayala, who recently split with fiancée and 24 actress Elisha Cuthbert, 23, is close friends with Jess' best friend and assistant CaCee Cobb. "That's a complete hoax," a Simpson source tells Star. "I think Trace is hanging around Jess because he wants to be her boyfriend," the source says. "But Jessica told Trace she can't date him 'publicly' for at least six months. Trace is gaga for Jessica, so he'll go along with anything at this point."