Kris Humphries

Ms. Kardashian steamed up South Beach Friday with boyfriend Kris Humphreys, walking along the main drag, Collins Avenue.

Kim wore a strapless khaki romper with cork platform heels, while b-baller Kris was dressed down in shorts and a t-shirt.

But just when Kim K thought all eyes were on her ... this tie-dyed wonder showed up outta nowhere and stole the spotlight!

Kris Humphries

Just who is this mystery blonde?