UFC 137 weigh in photos gallery for 'Penn vs Diaz' from Las Vegas

Tomorrow night (Oct. 29, 2011), fans of mixed martial arts are in for a real treat, as the world's largest fight promotion invades the Mandalay Bay Events Center in Las Vegas, Nevada, with UFC 137: "Penn vs. Diaz."

The event features welterweight warmongers Nick Diaz and B.J. Penn, who made each other's acquaintance at the weigh-ins by rubbing foreheads and exchanging heated looks of destruction to get us pumped for fight night.

And after that staredown, it's damn near impossible not to be.

Heavyweights are also in action across the board, as Matt Mitrione looks to continue his climb up the ladder against Cheick Kongo while Mirko Filipovic might be calling it a career after squaring off against  Roy Nelson.

Check out the photos from today's (Oct. 28) weigh-in event (via LowKick.com) in "Sin City" after the jump. Click here for complete results, click here for staredown pics and click here for staredown videos.

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