The 28-year-old star said she feels comfortable around the reality TV personality, reported Entertainment Tonight.
"Around Rob, I'm always able to speak my mind and speak freely and not care. I can do the craziest stuff or say the craziest stuff, and he doesn't judge me.
"Like if my stomach hurts, I don't have to pretend. I can go straight to the bathroom. It's those little things that really make a big difference," she said.
Chyna, who is pregnant with Rob's child, also revealed that their baby will not have a letter 'K' in his or her name.
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