Ronda Rousey: Vin Diesel's Daughter Is Legit ... Could Be A UFC Superstar

Ronda Rousey says Vin Diesel's 7-year-old daughter Hania really does have what it takes to dominate in the UFC (when she's older) ... telling TMZ Sports, "We could really make it happen!"

Ronda says she's been super impressed with Hania ever since she met the little girl -- even though they've barely trained together.

"I've only really seen her beating up on her dad and giving me tips," the UFC champ says ... "I'm looking forward to giving her tips."

But at an event to promote her fight at UFC 193, Ronda says she really likes what she sees.

"I think she definitely has the attitude [to be a world beater], for sure ... and that's what you really look for at a young age, not exactly the skills that they have, but the kind of attitude they have. And she definitely has the attitude of a fighter."

BONUS -- We also asked Ronda if she's still planning on going to the Marine Corps Ball with Lance Cpl. Jarrod Haschert, despite the fact she has a boyfriend now.

Let's put it this way, Ronda doesn't back down from ANYTHING.