Here’s the press release from ABC:

August 13, 2012

The 13th contestant (“Viewers’ Choice: All-Star”) with His / Her Professional Partner Will Be Announced on “Good Morning America,” August 27

“Dancing with the Stars: All-Stars” Premieres Monday, September 24

“Dancing with the Stars: All-Stars” marks the first time prior contestants will return for another chance at winning the coveted mirror ball trophy for a very special All-Star season. From former champions to fan favorites, including a celebrity voted in by fans, the stars and their professional partners will return to the ballroom on live national television during the season premiere of “Dancing with the Stars: All-Stars,” MONDAY, SEPTEMBER 24 (8:00-10:00 p.m., ET), followed by the premiere of “Dancing with the Stars the Results Show” on TUESDAY, SEPTEMBER 25 (8:00-10:00 p.m., ET) on the ABC Television Network.

In a show first, fans will determine who the final All-Star cast member will be. The three celebrities vying to fill the 13th spot on the cast are Sabrina Bryan, Carson Kressley and Kyle Massey. Fans can vote for their favorite “Viewers’ Choice: All-Star” at www.ABC.com/DancingwiththeStars, presented by Diet Pepsi until Friday, August 24 at 12:00 p.m., PT, to determine which of the three celebrities will be named the final All-Star contestant. Once voting has closed, the final cast member and his/her professional dance partner will be announced live on “Good Morning America” on Monday, August 27.

As announced today on “Good Morning America,” the 12 out of 13 celebrities and their professional partners heading to the dance floor this season are:

• KIRSTIE ALLEY partners with MAKSIM CHMERKOVSKIY, who returns for his 13th season.

• PAMELA ANDERSON teams with TRISTAN MACMANUS, who returns for his 3rd season as a professional partner.

• HELIO CASTRONEVES joins CHELSIE HIGHTOWER, who is returning for her 7th season.

• JOEY FATONE partners with two-time champ KYM JOHNSON, who returns for her 12th season.

• SHAWN JOHNSON joins three-time champ DEREK HOUGH, who returns for his 10th season.

• DREW LACHEY teams with ANNA TREBUNSKAYA, who returns for her 10th season.

• GILLES MARINI partners with last season’s champ, PETA MURGATROYD, who is returning for her 3rd season as a professional partner.

• KELLY MONACO joins VALENTIN CHMERKOVSKIY, who returns for his 3rd season.

• APOLO ANTON OHNO teams with Season 13 champ KARINA SMIRNOFF, who returns for her 12th season.

• BRISTOL PALIN teams up with two-time champ MARK BALLAS, who is returning for his 11th season.

• MELISSA RYCROFT joins TONY DOVOLANI, who returns for a 14th season.

• EMMITT SMITH partners with two-time champ CHERYL BURKE, who returns for her 14th season.

“Dancing with the Stars: All-Stars” and “Dancing with the Stars: All-Stars the Results Show” return this season with new surprises and all the performance elements viewers have come to know and love: “Macy’s Stars of Dance” features some of the best choreographers and performers from the different styles of dance who offer viewers performances that represent the peak of achievement in their genres. The show also welcomes the return of the “AT&T Spotlight Performance,” which features and celebrates people whose lives have been changed forever by dance. AT&T is helping in the search to find these performers by allowing fans to nominate potential dancers.

Hosted by Tom Bergeron (“America’s Funniest Home Videos”) and Brooke Burke-Charvet (“Dancing with the Stars” Season 7 Champion), the celebrities perform choreographed dance routines which will be judged by renowned Ballroom judge Len Goodman and dancer/choreographers Bruno Tonioli and Carrie Ann Inaba.

Viewers may cast their votes for their favorite teams via phone on Monday night during and up to 60 minutes after the “Dancing with the Stars: All-Stars” performance shows. AT&T customers may also vote by texting the word “VOTE” and entering the number that corresponds to the team they want to support (message and data rates may apply). Online voting at www.ABC.com is open from the start of each episode on the East Coast and closes at 8:00 a.m., PT/11:00 a.m., ET on Tuesday mornings. Additionally, fans can now vote on Facebook www.facebook.com/dancingwiththestars. A custom Facebook app sponsored by AT&T will let fans vote, share who they voted for and why, as well as see who friends voted for. They can also access the “After Party: Dancing with the Stars” live stream, the DWTS Social Buzz page, and the AT&T Spotlight Performance and Casting Call from the app.

Also new this year is “After Party: Dancing with the Stars,” a 15-20 minute live show that takes place online at www.ABC.com/DancingWithTheStars, Facebook, and YouTube immediately following each Monday night performance episode. Sponsored by AT&T, this original online video show will feature a host, a panel of dance experts, show talent and celebrity guests breaking down the highlights of the night and answering questions via Twitter, Facebook and ABC.com

“Dancing with the Stars” is the U.S. version of the international smash hit series, “Strictly Come Dancing.” This version is produced by BBC Worldwide Productions. Conrad Green serves as executive producer and Ashley Edens-Shaffer and Joe Sungkur are co-executive producers. Alex Rudzinski directs. “Dancing with the Stars” is broadcast in 720 Progressive (720P), ABC’s selected HDTV format, with 5.1 channel surround sound. This program carries a TV-PG,L parental guideline.