Check out this photo posted to X early Monday morning ... it shows BC and KW from behind, standing at a kiosk ordering their meals at a McDonald's in Tokyo.

Kanye is customarily dressed down in baggy white pants and a green jacket. Bianca, on the other hand, is wearing shiny silver spandex leggings with a matching strapless brassiere.

The person who shot the image wrote in the caption,  "My friend just had a Little chat with Kanye West at a Mc Donalds in Tokyo."

As we reported last week ... Kanye and Bianca have been making the rounds in Tokyo, with BC sporting a sexy new look each day. On Halloween, Bianca chose to wear a tight baby-blue dress to a party, covering up her amazing bod more than usual, but still showing off her legs.

The previous night ... Bianca rocked black lace nipple-covers with a matching thong to the Maison Margiela Gallery bash. Her hair was blonde instead of her usual black 'do.

Oh, and Kanye was right there beside Bianca in a white sweatsuit, guzzling from a drinking glass.