Hyland_Cake_Bank460.jpgHyland_Gift_Bank_Prokop460.jpgDenise Truscello, WireImage

Sarah Hyland is now legally able to party in Sin City! The gorgeous Modern Family actress celebrated the big 2-1 at The Bank Nightclub at Bellagio in Las Vegas.

A source from inside the club tells us the birthday girl, wearing a Chagouty Couture dress, hit the hotspot with 10 friends in tow including her boyfriend Matt Prokop. The party made its way to the VIP area where guests were seen tossing back Peligroso tequila shots and flutes of Beau Joie champagne.

Sounds like a night to remember. Happy birthday, Sarah!