Demi Lovato rocks out to a packed crowd at London’s flagship Apple iTunes Store on Wednesday night (April 22).

The 16-year-old singer performed an exclusive set from her debut album, Don’t Forget for contest winners. Some of the hits performed: “Behind Enemy Lines” and “Don’t Forget.”

Before the event, Demi received some very exciting news. She graduated from high school! Demi tweeted, “I GRADUATED!!!!!!!”

Congrats, Demi!

CLICK HERE for pictures.

-Source: JustJaredJr.

Demi performing Behind Enemy lines and Don't Forget at the London Apple Store.