Justin Bieber had better watch his back! His Peruvian "twin," (left) Alejandro Aviles -- aka the Peruvian Justin Bieber -- was out to romance his girl, Selena Gomez.

Dozens of Justin and Selena fans went wild when the Bieber look-alike placed a giant cardboard cutout of the Disney darling under his arm and declared his love for her. Stalker?

Fans of the singing TV starlet, and Aviles, visited the San Isidro hotel, where the pop star had been staying since arriving in Peru Wednesday night. Her show was on Thursday night. She's scheduled to play two shows in Argentina and one in Uruguay this week.

Aviles and the screaming fans remained at the hotel, awaiting a glimpse, and perhaps a hello, from Selena.