Engaged couple Alec Mazo and Edyta Sliwinska party with Kelly Monaco and Cheryl Burke

By Mark Gray
Updated August 13, 2007 04:15 PM

Before they waltz down the aisle in September, Dancing with the Stars alumni Alec Mazo and Edyta Sliwinska took their love to Las Vegas for a joint bachelor and bachelorette party over the weekend.

Along for the celebration was Mazo’s Dancing partner (and season one champ) Kelly Monaco, Cheryl Burke with boyfriend Matthew Lawrence, Kym Johnson and Karina Smirnoff.

The group arrived Saturday, got settled into a suite in the Planet Hollywood Hotel and immediately parted ways, according to a source. The girls went off to the hotel’s Heart Bar and later partied at Moon Nightclub at the Palms, while the guys took their party to a boat at nearby Lake Mead.

During the most recent season of Dancing Mazo was partnered with model Paulina Porizkova, and Sliwinska danced with former Cheers star John Ratzenberger.

The parties wrapped up on Sunday in true bachelor/bachelorette party style – relaxing at Bare, a top-optional pool at the Mirage, followed by some gambling.