Ron-Ron Got a

New Birthday Tattoo --

Fist Pump!

12/14/2010 5:30 AM PST BY TMZ STAFF
Less than two weeks after Pauly D got some fresh ink, Ronnie from "Jersey Shore" spent some time under the gun and got his arm seriously tatted up.

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Ronnie endured a six-hour session at Mario Barth's King Ink in Las Vegas earlier this week to complete his heaven and hell themed tattoo. Ronnie's on and off girlfriend, Sammi Sweatheart, was there as well.

Happy birthday, tattoo. Happy birthday, tattoo. Happy birthday, dear Ronnie. Happy birthday, tattoo.