(Yahoo!) - Kevin Federline is officially a married man.

Britney Spears's ex exchanged vows with his girlfriend, Victoria Prince, on Saturday in a penthouse at the Hard Rock Hotel in Las Vegas.

The duo, who have been dating since 2008, got engaged earlier this weekend and wasted no time in becoming a Mr. and Mrs. They picked up a marriage license at 8:42 p.m. on Friday in Las Vegas, according to Clark County records.

After that … wedding bells were a ringin' for the pair, who are parents to daughter Jordan Kay, 1.

The catch? Before Friday, Prince had no idea she was about to become Mrs. Federline this weekend.

The former Washington State University volleyball player, 30, apparently thought they were just headed on a family road trip to the Nevada hotspot.

While details remain short on their surprise nuptials, sources confirm that their daughter was in attendance. We do have a sneak peek of what could have been the wedding locale, though. On Friday, Prince shared an Instagram video showing off their Sin City penthouse, which features a hot tub, stripper poles, a pool table, and a stellar view of The Strip.

Federline's rep refused to comment on the couple's Las Vegas wedding. 

This is the second marriage for Federline, 35, who was previously married to Britney Spears from 2004-2007. He shares two children with the "Toxic" singer. The former backup dancer also has two children from his relationship with Shar Jackson. 

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