Gwyneth Paltrow Total Bummer

EXCLUSIVE

0209_gwyneth_paltrow_butt_booty_launchGwyneth Paltrow defies 43 years on earth ... especially from the rear.

Gwyn basked in the sun during a photo shoot in Malibu -- a day after squaring off in court with her alleged stalker.

She's in serious competition for some other butts out there ... depending on your taste.