Kim K: It's 'Cool' Kris Says His Mom Is More Beautiful Than Me

Kim Kardashian says she's totally fine with the fact her fiance Kris Humphries chose ANOTHER woman -- his mom -- as the most beautiful woman on the planet ... calling it "sweet."

Kim was leaving a nail salon in Bev Hills yesterday ... when she told us, it was "Definitely cool for him to say ... I thought it was sweet."

In case you missed it -- Kris seemingly whiffed on the most softball question ever last week, when he was walking WITH KIM and someone asked if he thought she was the most beautiful woman in the world ... and he didn't just say YES!!!