by Radar Staff
The romantic pair spent the weekend lounging by the pool at the London Hotel in West Hollywood before hosting the lavish bash for their friends and family on the hotel's rooftop garden.
The intimate party began at sunset with Vanessa, 30, and Nick, 37, greeting guests including Drew Lachey and NFL quarterback Matt Leinart.
Vanessa donned a classic white gown with a black sash for the party and joined her friends on the dance floor till the early hours.
Nick and Vanessa became engaged last November. His ex-wife Jessica Simpson followed just a week later with her boyfriend Eric Johnson.