Dancing With The Stars Hollywood All Stars Kirstie Alley DWTS Dancing With the Stars Joey Fatone Kym Johnson

But this isn't just any DWTS practice session -- it's the All Stars!

Over the weekend we spotted Kirstie Alley, Joey Fatone, Kym Johnson, Giles Marini and Maksim Chmerkovskiy at rehearsals in Los Angeles, and it may be a holiday weekend, but they're all busting their butts in preparation for the season premiere later this month.

Joey and Kirstie may not be back in top dancing form just yet, but let's not forget that each of them finished in second place when they competed (Joey in season 4, Kirstie in season 12). Think either of them has a shot at taking home the coveted mirror ball trophy? Or will Pamela Anderson or Apolo Anton Ohno waltz away with the prize this year?

In case you forgot, click through to see all the pros and stars on the roster this season ...