The Ultimate Prom dress store located in Peabody, Massachusetts. The boutique that has the BEST prom dresses in Massachusetts. Bettyonce's Boutique Inside South Shore Plaza Mall in Braintree Mall 2nd Floor above Target, across from The North Face Belle of the Ball provides prom dresses and accessories to high school juniors and seniors in Massachusetts who might not otherwise be able to go to prom. The Boston 25 team is here helping girls Prom dress available in the store . , 100 CambridgeSide place , Cambridge, MA. 02141 (second floor)