Pop singer Ariana Grande began her career on Broadway in the short-lived 2008 musical 13, but now she’s reached a whole new level of fabulousness! The Nickelodeon star—whom you’ll recognize from Victorious or Sam & Cat, or the buzzy upcoming movie Swindle—is on a major concert tour for her album Yours Truly, so of course we couldn’t miss the chance to catch her during her August 14 show at the Best Buy Theater. After the show, Grande was congratulated by former 13 co-stars Aaron Simon Gross and Elizabeth Gillies. Grande's album, which includes her hits "Baby I" and "The Way," will hit stores on September 3. Check out the gallery of exclusive shots from the front row and backstage of this Grande event!