Jennie Garth and Melanie "Mel B" Brown
Colin Knight/JPI; Andy Fossum/Startraks
The dance cards for season five of ABC's Dancing with the Stars
have officially been filled – with a Spice Girl, an Abercrombie & Fitch model, a boxer, a billionaire and a Las Vegas icon
all part of the 12-person mix.
The names were revealed on Wednesday's Good Morning America
host Tom Bergeron, show judge Carrie Ann Inaba and season-four champ
And, they are:
, 32, Spice Girls ("Scary Spice") singer (pro partner: Maksim Chmerkovskiy
, 22, actress/singer (The Cheetah Girls) (pro partner: Mark Ballas
, 32, racecar driver (pro partner: Julianne Hough
, 48, businessman (owner of NBA's Dallas Mavericks) (pro partner: Kym Johnson
, 35, actress (Beverly Hills, 90210
) (pro partner: Derek Hough
, older brother of Julianne Hough);
, 29, supermodel (pro partner Alec Mazo
, 38, actor (All My Children
) (pro partner: Edyta Sliwinska
Floyd Mayweather, Jr.
, 30, boxer (pro partner: Karina Smirnoff
, 65, singer (pro partner: Cheryl Burke
, 47, singer/doll designer (pro partner: Jonathan Roberts
, 22, supermodel (pro partner: Anna Trebunskaya
, 56, actress (pro partner: Tony Dovolani
Although over the past few days there have been some leaks about the purported new cast – prompting Dancing
's executive producer Conrad Green to tell PEOPLE that "so many wrong names ... get out, I think, ha-ha" – what remains still to be revealed to viewers when the series returns on Sept. 24 is a new format.
For the season debut, the show will air on three consecutive nights its first week, with the six female contestants performing on Monday and the six males on Tuesday. One contestant will then be sent home on Wednesday's live results show.
Starting the second week on Oct. 1, the show will air on two consecutive nights: the performance show on Mondays and the live results show on Tuesdays.
The decision to split the cast was deliberate, Green says, "so you can actually get to know the people and see them all over two nights. There are a lot of stories to tell – what they have been through, how they got here, their backgrounds, their motivations for doing it."
With the dancers in place, Green says there's one more casting decision left to make: Who will fill in for host Samantha Harris while she's on maternity leave?
Harris, who's due to give birth to her first child in early October, recently told PEOPLE, "My hope is to be there for the beginning of the season for a week or two, maybe three, have the baby and maybe be gone for two, three, four weeks – and, if I'm lucky enough to have a quick recovery, be back on the show for the rest of the season."
See Dancing champ Cheryl Burke answer PEOPLE readers' questions!