Gwyneth Paltrow doesn't mind getting naked.

She's in amazingly hot shape thanks to celeb fitness trainer Tracy Anderson.

"I'm religious about that, so luckily, most of the time, when you ask me to take my clothes off, I'm pretty good to go," Paltrow told me yesterday while promoting her new romantic dramedy Thanks For Sharing.

But not if there are cameras rolling.

Paltrow had to strip down to some very naughty La Perla lingerie in the film to a lap dance to hunky Mark Ruffalo.