David Hasselhoff got into a blow-out argument with his girlfriend last night, and hotel security had to intervene - right before his 59th birthday party.

Hasselhoff and Hayley Roberts were at the Wynn in Vegas to celebrate his birthday. Friends were throwing the bash for him at Blush, inside the hotel.

Earlier in the evening, however, Hasselhoff's girlfriend made a call to security and one source says she appeared to have been in some sort of distress.

Security came, and for a while there was some question as to whether David would make it to his own party, but as seen above, he did indeed show.

Everyone then calmed down, no arrests were made and no charges were pressed against Roberts or the former America's Got Talent judge.

Happy birthday, The Hoff.

[Photo: WENN.com]