Oh, who are we kidding? Sure, Ashton Kutcher may pretend like he's a grown-up. He turned 32 over the weekend, after all (why, he's old enough to be Demi Moore's son – if she had him when she was 15, that is). But we know he's just a big kid at heart.

The first time he hosted 'Saturday Night Live' (Sat., 11:30PM ET on NBC) in 2003, he ripped his pants off. You can pretty much guess what happened this time he hosted the show. Yep, they came off again.

Watch the video after the jump.Oh, who are we kidding? Sure, Ashton Kutcher may pretend like he's a grown-up. He turned 32 over the weekend, after all (why, he's old enough to be Demi Moore's son – if she had him when she was 15, that is). But we know he's just a big kid at heart. The first time he hosted 'Saturday Night Live' (Sat., 11:30PM ET on NBC) in 2003, he ripped his pants off. You can pretty much guess what happened this time he hosted the show. Yep, they came off again.