updated 06/08/2011 AT 2:20 PM ET
•originally published 06/09/2011 AT 9:10 AM ET
Looks like Nikki Blonsky has plenty to sing about: The Hairspray star has a new boyfriend, aspiring model/actor Tommy Potoeski, a source confirms to PEOPLE.
The actress, 22, stepped out with her new man, 25, Monday, sharing a kiss on the streets of New York.
The party dined for four hours, capping off their meal with an oversized cupcake from Crumbs bakery and a customized cake baked by restaurant owner Joey Verdone.