Complete with whisky shots, champagne and even a mini wife-to-be stand-in for Vanessa Minnillo, the Sing Off host waved goodbye to the single life.
When Nick partied Friday night away with VIP treatment at TAO nightclub, he was presented with a ball and chain cake inscribed with "Property Of Vanessa," a nod to Minnillo's own bachelorette party where she announced "I'm about to get a ball and chain."
Minnillo was famously serenaded by a 'mini Nick' at her party a few weeks earlier.
Lachey - who was married to Jessica Simpson from 2002 to 2006 - was joined by 30 of his friends, including his brother Drew Lachey and Houston Texans quarterback Matt Leinart.
The couple's wedding, which is reportedly set for July 16th , will be filmed for a TLC special.