The socialite explained although she is proud of her younger sibling for taking part in the celebrity dance show, she gets so nervous when he competes that she feels sick and can't imagine ever taking part herself.
She said: "I want to vomit. I get so anxious, it's not like good. Mondays and Tuesdays. They're so stressful. I could never do that show. If I can't watch him, I don't think I could do it."
She told American OK! : "We were all there the first night he danced. It's just so cool to see his confidence grow. I've definitely seen different sides of him that I didn't think he'd be able to do.
"I went to a ton of his rehearsals; I was such a stage mom. I was like 'Smile! Smile. Do it again!' I'd videotape him so he could see it.
"So I definitely was a little crazy but he's doing so amazing. I'm just really proud of him."