This is the fourteenth in a series of articles by The Underwear Expert

Taylor Lautner turned 21 over the weekend. If you're just now realizing how young he really is, don't worry...we were surprised, too! Even if he makes us all feel old, we do want to wish Little Taylor a happy birthday. Now he can go out and have his first beer (only one, though...can't spoil the abs).

To celebrate the anniversary of his birth, we put together a gallery of our favorite Taylor Lautner sightings, several including underwear. Enjoy the photos and let Boy Culture and The Underwear Expert know how you'd spend your twenty-first birthday if you were the Twilight star...or how you'd like to spend his with him...

Our little pup has become a wolf. Here, he reminds us that we promised ourselves to hit the gym today.

In his GQ gallery, Lautner shows off athletic sweats and the waistband of his underwear. If you're going to wear sweat pants, make sure they look like this.

Above, Taylor spends some of his time off (now that Twilight is over) goofing off on his front lawn.

Here, Taylor and some dude do the wave. Hi, Hanes!

Finally, here's one just because.