Now that there's just seven pairs left on Dancing with the Stars, Rob Kardashian is thanking his lucky stars.

"I really didn't know what to expect, but I'm really surprised that I'm still here. But I'm very happy to be here and I'm enjoying it," Kardashian, 24, tells Us Weekly on how he's feeling about having lasted six weeks on the hit ABC show.

The Keeping Up with the Kardashians star admits, however, that the commitment has taken a lot away from his social life, which includes having to miss his sister Kim's 31st birthday bash in Las Vegas Saturday.

"I needed to rehearse and stuff, so I was stuck here," says Kardashian. "They said it was fun, but I'm sure Kim didn't party too hard! They don't care that I'm not there -- they just want me to keep doing what I'm doing and keep focusing and move onto the next round and keep pushing."

Now that the Kardashian klan is all back on the west coast (Kim and Kourtney had been shooting in NYC the past two months) they're stepping out en mass to support Rob on Monday night's show.

"So excited to watch @RobKardashian dance tonight! The whole fam is going to support! He goes on first at 8pm! #Vote4Rob," Kim, 31, tweeted on Monday.

And although he appreciates the support, Rob adds, "I don't even see my own family when they're in town, I've been so busy. I've had no time to do anything! But I hope when DWTS is done and all that stuff, that I will."