Celebs In Costume: Halloween 2010 Gets Underway

Getting the holiday weekend off to a grand beginning, the stars were out on Friday night (October 29) showing off their costume choices for Halloween 2010.

Drawing plenty of big names, a private Beverly Hills soiree brought out baboon dressed "Titanic" hunk Leonardo DiCaprio, who tried his best to smoke a cigar through his mask during the festivities.

Also on hand for the Beverly Hills bash were a sexy kitten-clad Molly Sims as well as WWE babe Stacy Keibler, who joined a few gal pals in dressing up as the Three Amigos.

Meanwhile, recently divorced actor David Arquette channeled Elvis Presley while out partying amidst his hosting efforts for the AMP Energy Juice Short Film fete for "The Legend of Hallowdega."

Last, but not least, party girl Tara Reid was on the opposite coast as she sported a tiny Barbie ensemble at the Cipriani Downtown Halloween 2010 party held at Cipriani SoHo.

Enjoy the pictures of the celebs out in full costume for the Halloween weekend (October 29).