“You ruined my Ariana Grande shirt,” said Shay to Bria ... even snagged a video with influencer Big Sexy jumping up and down behind them as they strutted through a crosswalk.

Ariana Grande’s look alike ... the 20-year-old wore a pink and white striped button-down dress and a pink ruffled shirt. The imitation, which was also uploaded to Paige’s Instagram page ...