Selena Gomez entertains City Hall Plaza for 103.3

Actress-singer Selena Gomez was the big name at 103.3 AMP Radio’s first birthday celebration at City Hall Plaza on Sunday. Gomez, who was recently spotted with Justin Bieber-esque singer Austin Mahone at Disneyland, was on a concert lineup that included Jason Derulo and Boston’s own Sammy Adams. Mahone will be in Boston soon when he opens for Gomez’s pal Taylor Swift at Gillette Stadium.

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