EXCLUSIVE: Kim Kardashian Gushes Rob Will Be a 'Great Dad,' Reveals Kanye West Gives Parenting Advice

Kim Kardashian West says she is "really happy" for Rob Kardashian and Blac Chyna.

Though the reality star's relationship with her brother and onetime BFF has had its ups and downs-- on Keeping Up With the Kardashians, she blasted him for having "no loyalty," but has since been spotted out with the couple -- she couldn't help but gush over the expectant parents when ET caught up with her at Cannes.

"I mean, it's so exciting. It's a really exciting time for him," Kim told ET at the de Grisogono party on Tuesday. "I think he'll be the best dad. He's really just such a good, good person."

EXCLUSIVE: Kris Jenner Is 'Thrilled' About Blac Chyna's Pregnancy and 'Excited to Have Another Grandchild'

Blac Chyna is Pregnant! Rob Kardashian and Fiancee Expecting First Child

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Rob and Chyna announced their pregnancy earlier this month after getting engaged in April. This is his first child and her second -- she has a 3-year-old son with Tyga. So, are Kim and husband Kanye West passing on parenting advice to first-time-dad?

"We give him -- I think more me -- gives him advice and it's just been a really fun time," the mother of two said. "I'm really happy for them."

Kim wasn't the only KUWTK star that jetted to the south of France for the film festival. Kendall Jenner and Kourtney Kardashian's ex, Scott Disick, have been spotted partying -- and holding hands -- in Cannes this week.

"Kendall and I missed each other," Kim shared. "I was like, 'How do we go across the world and miss each other?' So, I took her room. We swapped rooms. I saw all of her stuff in there that she forgot that now I can bring home for her! It's been fun."

EXCLUSIVE: Caitlyn Jenner Is 'Proud' of Dad-to-Be Rob Kardashian: 'Things Are Going Well'

As for big news in Kim's life, the 35-year-old mogul recently revealed that she'd hit her goal weight of 135 pounds after giving birth to son Saint in December.

"I've reached my pre-baby goal. I have a few pounds still to go, but I want to be before pre-baby, like five years ago," she clarified. "In that, I still have 15 to go. But I'm happy and I feel confident and very happy."

She showed off her recent weight loss -- and that confidence -- in a sexy blinged-out chainmail gown on the red carpet at the Hôtel du Cap-Eden-Roc in Cap d'Antibes, France.

"[The designers] literally landed in New York from China and they were sewing it, because it was too big and fixing it and I had nothing to wear underneath it and I just thought that was a little crazy," Kim explained. "I rushed on the plane, carried the dress and, you know, I wanted a piece of jewelry that would go with the look."

Meanwhile, Chyna has been firing back at body shamers who have been hating on her pregnancy weight gain. Find out what she had to say in the video below.

Rob Kardashian Jokes About Having a Son as Blac Chyna Shows Off Her Growing Baby Bump

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