Cher Lloyd performed 'Want U Back' on 'America's Got Talent' last night (25.07.12).

The singer - who turns 19 years old on Saturday (28.07.12) - was introduced onto the stage by the talent show's host Nick Cannon, who described her as a ''teen sensation'' before she launched into a performance of her first single in the US.

The 18-year-old star admitted on the show that her US campaign has gone ''much better'' than she thought it would, and then Nick - who is married to Mariah Carey - said she sounds like TV host Sharon Osbourne.

During the performance Cher was accompanied by a number of backing dancers as she sang in a makeshift American diner that looked similar to the song's music video.

'Want U Back' has reached number 16 on the Billboard Hot 100 chart and it peaked at number six on the US iTunes chart.

Following the success of her single, Cher is due to release her album 'Sticks + Stones' in the US on September 18.