Lady Gaga — Crotch-Thrusting Into Birthday Cake [Video]

Lady Gaga stripped down to her thong and banged a piece of birthday cake … and thankfully, Terry Richardson captured the entire thing on video tape.

Richardson — the god-like genius who also directed the video of Kate Upton doing the Cat Daddy in a bikini — released the clip on Gaga”s official YouTube page.

And if you”re concerned about Gaga”s personal hygiene after her romp with the dessert … don”t worry, she takes a bath at the end of the clip.

God bless you Terry Richardson.