Kris Jenner: Let's Talk About Birthday Sex

Kris Jenner's 60th birthday ended with a bang ... from her boyfriend, or at least that's what she wants us to think.

Kris touched down at LAX on Wednesday -- returning from the "Victoria's Secret Fashion Show" -- and on the heels of her huge birthday extravaganza ... we had to know what was her fave gift.

With bf Corey Gamble right next to her, Kris gave us a very SLY answer and squarely put the SEX in sexagenarian. And right after that -- in slightly related news -- Kris gave us a review of her ex, Caitlyn Jenner's fashion in NYC.

Not awkward, at all.