Kim Kardashian: Rob “Has Grown Up So Much” on Dancing with the Stars

Rob and Kim Kardashian
Kim Kardashian is basking in sisterly pride after watching little brother Rob Kardashian shine in the finals of Dancing with the Stars.

“Doing this show has really changed Rob,” Kim, 31, a former Dancing contestant, tells Celebuzz. “Hes really grown up so much and its been incredible to watch him each week.

As a tuxedo-clad Kim joined sister Khloé and mom Kris Jenner in the ballroom on Monday, Rob, 24, scored his first perfect 30 for a daring freestyle dance in which he lifted and twirled pro partner Cheryl Burke.

We were all so blown away by Robs performances last night,” says Kim. “Each week he works so hard and is always prepared, but [we] never knew he would get a perfect score!! We were all amazed and so happy! Rob is so excited to have made it this far and I am so proud of him.”

Rob became an unlikely frontrunner, pulling ahead of favorites J.R. Martinez and Ricki Lake in the race for the mirror-ball trophy, which will be handed out on Tuesday”s show.