Justin Bieber, Lady Gaga take 'Today Show' stage

lady-gaga-justin-bieber.jpgIf you like nothing better than waking up to a little "Bad Romance," then mark July 9 on your calendar.

That's the day that Lady Gaga will take over the plaza outside Rockefeller Center in New York as part of the annual summer concert series. The show has assembled a number of big names for its 15th summer series, including teen sensation Justin Bieber, Christina Aguilera, the next "American Idol" winner and runner-up, previous "Idol" Carrie Underwood and Keith Urban.