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Pauly D is still putting the G in GTL.

One week after appearing a little bigger than usual on the red carpet (left), the "Jersey Shore" star stripped off his shirt to prove he's still ripped.

Last week, the Internet went wild after a thicker-looking Pauly popped up at an event in Las Vegas ... leading many to believe he'd packed on some pounds on his time away from the Shore.

"Ok Just To Clear Up A Few Things ,,, THere You Go !!!! Taking This Morning," he tweeted alongside the shirtless photo above (right) yesterday ... a clear response to the weight gain rumors.

With another shot (below), he added "Just In Case U Still Confused."

While Pauly looks like the Guido we've come to know and love, some of his co-stars have gone through some serious transformations since starting on the show. See how they've all changed in the gallery above!

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