Beyonce Showed Off Her BIG OLD PREGNANT BOOTY At The Game Last Night . . . Her BELLY Ain't The Only Thing THAT GOT BIG!!

Beyonce and Jay Z attended last night's L.A. Clippers game. Unfortunately their team - The Clippers - lost.

Look at Bey and her GIANT PREGGO BUTT. We know Jay is hoping and praying that it STAYS after she gives birth.