Both Wyclef Jean and proud daddy Matt Damon support their pet cause of children's charity OneXOne by getting their hands dirty and volunteering in the field. But it's not all grit and hard work. Every now and again, well-meaning celebs have to show up to black tie events and raise money.

So here's Matt Damon, smiling on the red carpet with another gaggle of cute kids and fellow celebrity attendees of the San Francisco launch of the charity at the The Concourse Exhibition Center.

Goofy-looking Josh Groban (I know, everyone's mom is going to kill me for suggesting that) and Wyclef Jean both showed up awe well.

Featued in the gallery: Matt Damon, Josh Groban, Wyclef Jean, Nomar Garciaparra, Mia Hamm and David Arquette.

Click any photo to view all 15 photos from the ONEXONE childrens charity San Francisco launch in the gallery!

Just like Trick Daddy.

Both Wyclef Jean and proud daddy Matt Damon support their pet cause of children's charity OneXOne by getting their hands dirty and volunteering in the field. But it's not all grit and hard work. Every now and again, well-meaning celebs have to show up to black tie events and raise money.

So here's Matt Damon, smiling on the red carpet with another gaggle of cute kids and fellow celebrity attendees of the San Francisco launch of the charity at the The Concourse Exhibition Center.

Goofy-looking Josh Groban (I know, everyone's mom is going to kill me for suggesting that) and Wyclef Jean both showed up awe well.

Featued in the gallery: Matt Damon, Josh Groban, Wyclef Jean, Nomar Garciaparra, Mia Hamm and David Arquette.

Click any photo to view all 15 photos from the ONEXONE childrens charity San Francisco launch in the gallery!