Fresh faced TCA winner Ashley Greene pulls out the big legal guns to shut distrib of naughty nude pix circulating on the net.

The morning after winning a Teen Choice Awartd, raunchy images of the naked Twilight starlet, 22,  began circulating in cyberspace - the same day she was caught lip locking  Gossip Girl hunk Chace Crawford in the back seat of a car at LAX.

The steamy pix which include a full frontal body shot was immediately given a cease-and- desists salvo by Greene's rep:

"The photos in question, which appear to be of our client, are illegal and are being unlawfully displayed. Our client intends to take legal action."

Nothing like your shedding a kid image with adult pix -- - just ask Disney tween hottie Vanessa Hudgens who's already been "out-ed" twice.