Describing Rob, 28, as his "little brother," Montana said he loves the way the reality star is living her life currently, reported E! online.
"I think that anybody that makes you do great in life, motivates you, I think it's good for you. I love the energy Rob has right now. I just love that. He's in just a happy spirit," Montana, 31, said.
There were reports that the couple have broken up. However debunking the rumours, Rob posted a close-up picture of his and Chyna's face on Instagram.