It's a pop culture orgy! Albeit a G-rated one. The 24th annual Walt Disney World Christmas Day Parade, to be telecast by ABC Dec. 25 at 10 am/ET, will kick off with an dance number choreographed by Dancing with the Stars' Tony Dovolani and hoofed by Helio Castroneves and Julianne Hough, Sabrina Bryan and Mark Ballas, Joey Fatone and Kym Johnson, and Drew Lachey and Cheryl Burke. What's more, Vanessa Hudgens, Corbin Bleu, Monique Coleman, and Ashley Tisdale will perform a version of What Time Is It? (from High School Musical 2), and Miley Cyrus will croon "All I Want for Christmas is You." Also look for performances by Josh Groban and American Idol finalist Katharine McPhee, while Jessica Simpson will team with the Harlem Gospel Choir on "9 to 5" "Hark! The Herald Angels Sing. Regis Philbin and Kelly Ripa will cohost the Walt Disney World portion, with Ryan Seacrest overseeing the Disneyland happenings.