Real estate mogul Donald Trump's daughter IVANKA is dating THAT '70s SHOW star Topher Grace, according to media reports in the US. Ivanka was celebrating her 25th birthday in Las Vegas, Nevada on Saturday (28OCT06) and the pair were seen getting cosy. Grace, who starred as ERIC FORMAN on the hit TV series and plays the villainous Venom in the upcoming Spider-Man 3, was spotted with Trump several times during the weekend. According to American publication People, the pair danced, cuddled on the VIP bed and even shared a quick kiss during the party and then left holding hands. Before the birthday bash, Trump, Grace and friends including Grace's That '70s Show co-star Wilmer Valderrama had dinner at Las Vegas restaurant Social House and on Friday (27OCT06) they dined with friends at Bellagio's Fix. Trump, vice president of development and acquisitions for her father's Trump Organisation, is a regular on his US reality show The Apprentice. She was most recently romantically linked with Tour De France champion LANCE ARMSTRONG.