New couple alert: Ivanka Trump and Topher Grace?

Forget the Lance Armstrong rumors - Ivanka Trump spent Saturday night with her new man, "That '70s Show" star Topher Grace. The well-upholstered heiress celebrated her 25th birthday in Las Vegas, where spies say Grace was Trump's date. They canoodled on the balcony during dinner at Social House with a group including Grace's former co-star Wilmer Valderrama. Then, at nightclub Pure, they closed the curtains around their private table for a half-hour. The couple "never left each other's sides," said our source.

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