Kim shared this shot of herself naked in bed, and suddenly nobody's clamoring for her and Kanye West to announce their new baby girl's name.

Less than 72 hours after she was celebrating the arrival of their bundle of joy, Mama KK made sure to remind us she's still the fam's top sex symbol. Besides ... Kylie's on the shelf.

Gotta hand it to Kim -- best snap back ever!

Bonus reminder: Rolls-Royces are really nice too.