A Sundance source says, "Jessica has no reason to be at Sundance. She doesn't have a film to promote here, while Justin is in town talking about his new film Black Snake Moan. She's obviously here for him.
Biel, who regularly competes with Diaz in polls to find the world's sexiest actress, had been dating New York Yankees baseball star Derek Jeter. The couple vacationed together in Puerto Rico over Christmas.
Jeter is now being romantically linked to another actress, Gabrielle Union, after he was spotted dancing with her in the Bahamas last weekend.
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