(Cover) - EN Showbiz - Rob Kardashian has confessed that he is "insecure" about his body.

The 24-year-old younger brother of reality stars Kim, Kourtney and Khlo will make his debut on Dancing With The Stars tonight.

But he says that his costume fittings are "whatever" currently because he does not like how he looks in them.

"If I was in better shape, I honestly wouldn't care," he told Us Weekly about the spandex bodysuits admitting that he now weighs over 200 pounds.

"Obviously I'm a little insecure about certain things right now I'm just not used to dancer clothes."

Rob said that he wants to slim down during the hit competition show and has already noticed "little" changes in his body.

But he says that because he has not improved his eating habits the change isn't happening as quickly as he would like.

"I still eat pretty bad," he confessed. "If I were to take it another level up and eat well, I feel like I would notice more of a change."

He says that he still indulges in pizza, donuts and ice cream at the studio during rehearsals but wants to get his weight down to the "180s".

Rob says that he has found the experience challenging but he is not giving up.

"We will make it work," he said of his dancing partner Cheryl Burke. "I've definitely gone home during the first week and been exhausted and like, What am I doing? This is so hard and so frustrating!'"

"But if I can do this, then anyone can. I have no rhythm and I'm not crazy co-ordinated." (C) Cover Media