Backstage at DWTS: Rob Kardashian Talks Kim's Divorce: "My Sister Is Going Through a Lot"

Rob says he and the Kardashian family are "very supportive of whatever decision [Kim] makes"

Let it be known that Rob Kardashian doesn't dance around an issue.

Though Rob had his best performance in the competition so far tonight on Dancing With the Stars, everyone still seems to be talking about his older sister Kim Kardashian, who stole every headline earlier today when she filed for divorce from husband Kris Humphries after only 72 days of marriage.

So what did Kim's little brother have to say about her split when we caught up with him backstage?

While sister Kim was busy making a dash for the airport amidst a flurry of paparrazzi, Rob made it clear that he and the rest of the family are behind Kim no matter what.

"My sister is obviously going through a lot and we're obviously very supportive of whatever decision she makes," Rob tells us. "We're just here as her family just to be with her and be on her side for whatever."

And Rob's family also represented tonight at DWTS to show their support. While Rob's sister Kourtney Kardashian and baby daddy Scott Disick along with their son, Mason, donned costumes for the ballroom, Rob says he didn't have to buy one this year as the show's Halloween theme did the job for him.

"We didn't have to go Halloween shopping," he says. "They made it for us!" His partner Cheryl Burke thought the costumes, hair and makeup were so good that she says the show "deserves an Emmy" for the episode.

David Arquette also enjoyed Halloween week, saying, "I love Halloween, so this is a perfect time to just have some fun and be silly." His postshow plans? Taking daughter Coco trick-or-treating! Arquette tells us Coco is dressing up as a kitty-cat.

Not such a treat for Ricki Lake was the rib injury she suffered during rehearsals last week. Luckily, the pain didn't set her back she received the highest scores of the night. Her secret weapon? Her corsets! "It's like a pulled muscle in between my two ribs, and I'm in a corset for both dances tonight, so it really helped to be strapped in tight," she tells us.

And fret not, Ricki fans. She assures us that her rib injury is in fact getting better. "It's getting better. The problem is we don't get a day off," she explains. "We've been working seven days a week for two and a half months. It really does take its toll on your body."