Tonight at the 2011 Teen Choice Awards, Ashton Kutcher was the first nominee to pick up an award. The 'No Strings Attached' actor won the Choice Movie Actor: Romantic Comedy for his role in the rom com alongside Natalie Portman. During his acceptance speech, Kutcher closed with a massive sing-along to Katy Perry's 'Teenage Dream.'

Kutcher wore a fedora, a long hairdo, jeans and flip-flops as walked onstage to accept the award from the cast of 'Vampire Diaries.' Kutcher showed his age by comparing himself to singer Leif Garrett before he dispensed some advice to the teenagers in the audience. His words of wisdom? To never use a credit card if you don't have the cash to pay it off.

After he was finished acting as the wise old sage of the 2011 Teen Choice Awards, Kutcher brought back the fun times with a massive sing-along to Katy Perry's No. 1 single 'Teenage Dream.' It was definitely an appropriate song for the occasion, and it really got the crowd going, with almost everybody singing along. Although Kutcher's voice definitely won't get him nominated in the any of the music categories any time soon, he led the sing-along in such an enthusiastic way that it was impossible not to smile and hum along from home.

Watch Ashton Sing Katy Perry's 'Teenage Dream' in His Acceptance Speech