"Dancing With the Stars" contestants slim down

(CBS/AP) The theme of this year's "Dancing With the Stars" is loser - contestants losing weight, that is.

Even winners are losers. Ricki Lake has snagged high scores this season -- all while shedding pounds: 20 to be exact. So has fellow contestant Nancy Grace. The prosecutor-turned-TV personality says she's lost 23 pounds so far.

Grace has been showing more skin as she shrinks, and she said she'd be thrilled to dance in a leotard if she makes it to the finals on the hit ABC competition.

Reality star Rob Kardashian, who has shared his weight woes on the show, has also been shaping up. While he won't reveal an exact number, he says dancing is boosting his confidence and helping him slim down.

This isn't the first season "Dancing With the Stars" contestants have dropped weight: Last season, contestant Kirstie Alley lost a whopping 100 pounds, slimming down to a size 6. Kelly Osbourne lost about 40 pounds after competing on "Dancing with the Stars" two years ago. And in 2010, Kyle Massey said he lost about 30 pounds while competing on the ABC series.

Lesson learned: shake a move.