Kylie Jenner -- What Can I Say About Kim's Baby ... NOTHING

Kylie Jenner did her best "Walking Dead" impression Saturday when a photog asked her how she felt about sister Kim's new baby.

It's hilarious and ridiculous. Kylie was stone faced as she walked into a Miami restaurant with Hailey Baldwin. Kylie, of course, is in town for Art Basel.

If she won't, we'll say it ... Congrats Kim and Kanye!