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Chris Weidman and Carlos Condit are the HOTTEST fighters in the UFC ... according to 2 of the UFC's smokin' hot Octagon girls.

We talked to Chrissy Blair and Vanessa Hanson earlier this week in Vegas ... and asked them all the burning questions ... who's hottest, who has the best body, and dating fighters.

Hottest? Weidman. Best body? Luke Rockhold.

We also get into UFC guys sliding into their DMs ... even though dating fighters is "looked down upon."

But the best part? Chrissy and Vanessa give their BRUTALLY HONEST opinion on Brock Lesnar ... hot or not?

We caught up with Luke shortly after ... he was clearly flattered!

Check out the clips!