A birthday-suit biking craze is taking over Russia.

The latest in a recent string of ladies going au naturel is a woman caught on camera wearing only a thong, high heels and a helmet for a spin around Rostov on Don in southwestern Russia.

The nearly two-minute clip shows the busty babe ripping off her white bra before going for a ride on the back of a motorcycle.

Her practically nude ride got mixed reactions from fellow motorists — with some flashing her a thumbs-up, and others heckling her.

But the mystery woman didn’t seem to care — flipping the bird to her haters.