"Dancing With the Stars: All-Stars" is almost here (two-night premiere begins Mon., Sept. 24, 8 p.m. ET on ABC) and we've got the exclusive sneak peek at all 13 pairs in their very first rehearsals.

Who wore matching track suits their first day back in the studio? And which star's dance pants from last time no longer fit?

The 13 hilarious videos above have all the answers, plus some interesting dance tips like a penny in the fanny and nipples out. (Who knew?)

Watch the videos above and tell us: Which pair are you betting on to win it all in "All-Stars"?

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  • Pamela Anderson

  • Kelly Monaco

  • Gilles Marini

  • Shawn Johnson

  • Melissa Rycroft

  • Joey Fatone

  • Bristol Palin

  • Kirstie Alley

  • Emmitt Smith

  • Drew Lachey

"Dancing With the Stars: All-Stars" two-night premiere begins Mon., Sept. 24, 8 p.m. ET on ABC.

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