Justin Bieber and Selena Gomez snuck down to Mexico yesterday for a very private wedding — but put away the pitchforks, Bieber fans … they’re not the ones tying the knot.

TMZ has learned … the duo flew south of the border to attend the wedding of one of Selena’s friends Shannon Larossi — a costume designer Selena met on the Disney show “Wizards of Waverly Place.”

Selena’s one of the bridesmaids — and we’re told, she even plans to sing at the nuptials.

As for Justin — we’re told he’ll just be a regular super-famous guest … not a performer.

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Selena was seen leaving LAX airport December 1st to head over to Sacramento to play at 107.9 the End’s Jingle Ball!

Selena was seen exiting a restaurant in Ecino, Ca. with her step dad on November 18th.

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Those babies are so cute and they all look awesome together in the pictures! I uploaded all the pictures of Justin & Selena together and they are just so perfect together! Make sure to check out the gallery.Out to Dinner at Devant Vous ,Leaving Kiss Fm Studios ,Arriving in Madrid with Justin ,Leaving Tv Studios & Out to Eat in Madrid ,Wax Figures in New York & ,Leaving the Ama’s.

Selena went to Disney Land November 17th! Check out the photos!

Selena & Justin Bieber went out for an early breakfast at IHOP in Van Nuys earlier today (November 21, 2011). The High Quality Candids are now available in the gallery.