Security was called to intervene in a "heated row" between David Hasselhoff, 59, and his Welsh girlfriend, Hayley Roberts, 31, at the Wynn Hotel in Las Vegas, sources told TMZ. Later that night, at Hasselhoff's 59th birthday celebration at Blush nightclub, the two were seen happily kissing and holding hands.

Roberts, who is a part-time model and works the make-up counter of department store Debenhams in Merthyr Tydfil, Wales, "appeared to have been in some sort of distress" when security guards arrived at the couple's room. Roberts met the Britain's Got Talent judge when she asked for his autograph at a recent taping of the show in Cardiff.

The twice-married ex-Baywatch star has said of his leggy, blonde girlfriend, who appeared at his birthday bash in a sexy, royal blue dress, "She's a beautiful person and not Hollywood. She's just real." Engagement rumors have been circulating — largely stirred up by Hasselhoff himself, when earlier this weekend he tweeted to his fans, "Who's engaged?" (It turns out Roberts' sister recently announced her engagement.)

Hayley's mother Margaret, 53, has spoken highly of Hasselhoff's manners and said he treats her daughter "like a lady." She told the UK's Daily Mail that she would be "absolutely thrilled" if the two got married.

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