Ronda Rousey -- I Can Make Breakfast Sexy ... Debuts Carl's Jr. Ad

Ronda Rousey is following the footsteps of some unlikely people ... Paris Hilton, Audrina Patridge and even Kim Kardashian -- she's starring in a hot Carl's Jr. commercial.

The UFC superstar strips down to a sports bra and sexes it up to promote the Cinnamon Swirl French Toast Breakfast Sandwich.

She looks good ... damn good.

Gonna assume she got paid pretty well for the spot -- and, while it probably won't put her on the Forbes list, if she can continue to lock down mainstream sponsors like this ... she could definitely get there.