And they’re off! The 13 couples of Dancing With the Stars Season 15 All-Stars are busy rehearsing for the Monday, September 24 premiere. What are they dancing? Everyone is doing Cha-Cha-Cha or Foxtrot, but info is still trickling in via Twitter or interviews about who is doing what.

Here's the deal as of now, with updates to come:

FOXTROT
Kirstie Alley & Maksim Chmerkovskiy
Drew Lachey & Anna Trebunskaya
Melissa Rycroft & Tony Dovolani
Gilles Marini & Peta Murgatroyd
Shawn Johnson & Derek Hough
Helio Castroneves & Chelsie Hightower

CHA-CHA-CHA
Pamela Anderson & Tristan MacManus
Sabrina Bryan & Louis van Amstel
Apolo Anton Ohno & Karina Smirnoff
Bristol Palin & Mark Ballas
Emmitt Smith & Cheryl Burke
Kelly Monaco & Val Chmerkovskiy
Joey Fatone & Kym Johnson

Do you think Cha-Cha dancers have an audience advantage, since it tends to be a more “fun” dance than the Foxtrot? Or does it just depend on the Foxtrot dancers and choreography? Sound off in the comments below.

Dancing With the Stars Season 15: All-Stars will premiere on Monday, September 24 at 8 p.m. ET/PT on ABC. Check out the full All-Stars cast list here.

Gina Carbone is a contributing writer at Wetpaint Entertainment. Follow her on Twitter @ginacarbone.

For more news about Dancing With the Stars, Like us on Facebook and Follow us on Twitter.