Mack Wilds ... Cop Busts Midtown Champagne Celebration

Mack Wilds -- the "90210" dude who plays Adele's ex in the "Hello" video -- shut down traffic near Times Square after popping Belair bottles in the street.

Wilds and some friends, including NYC celebrity jeweler Mr. Flawless, chose a congested spot for the impromptu photo shoot ... the middle of 47th Street and 6th Ave.

Mack has something to celebrate. The song has gone 4 times platinum. The album is positioned to sell another million copies for the third week.