ABC News’ Taylor Behrendt reports:

It’s not easy to keep up with Rob Kardashian on the dance floor.

TV viewers have seen a whole new side of Kardashian on “Dancing With the Stars.” The youngest Kardashian has made a name for himself in the ballroom, breaking out of his shell and out of the shadows of his famous sisters.

Kardashian, 24, topped the leader board last week with a Superman-themed performance of the pasodoble.

He has far surpassed older sister Kim, 30, who was one of the first contestants to get the boot on her season of “Dancing.”

But it hasn’t all been about competition for Rob Kardashian. In week three, when the dances evoked the most memorable year of contestants’ lives, he chose 2003, the year his father, attorney Robert Kardashian, died of cancer. Rob was only 15 and said his world had been “flipped upside down.” Dedicating the foxtrot to his late father, he won praise from the judges and left his mother in tears.

Kardashian says his family is his biggest support system. Each week, a member of the Kardashian crew has been in the audience cheering him on.

“I love the fact that my family is there. It makes me super comfortable,” he said, “But they all get nervous.”

Now that Kardashian has reached the season’s half-way point, his partner and two-time “DWTS” champ, Cheryl Burke, is pushing him harder than ever. Kardashian and Burke will dance the rumba tonight.

“I was super frustrated in the beginning of the week with this dance because you got to be sexy enough,” he said. “I don’t consider myself sexy and it’s really uncomfortable for me.”

“GMA” special contributor Cameron Mathison got a first glimpse at the couple’s routine, but we obviously can’t share too much.  Watch Kardashian and Burke dance tonight on “Dancing With the Stars” on ABC at 8 ET/7 CT.