MAX NASH / Invision/AP 1 / 14
MAX NASH / Invision/AP 1 / 14

Ben Stiller is well aware that pal Jennifer Aniston is America's sweetheart -- who millions would love to see in the buff!

Which is why the actor brazenly promises, in a hilarious new PSA, that Aniston will bare her famous, totally nude assets in the name of charity.

PHOTOS: Stars' good deeds!

In a new clip, Stiller, 45, touts the so-called "See Jennifer Aniston Naked Foundation" -- much to Aniston's chagrin -- as he talks up his own, not-fictional Stiller Foundation.

PHOTOS: Jennifer Aniston's bikini body through the years

The "Zoolander" star's eponymous charity raises funds to build schools in areas affected by poverty around the world. (His "Stillerstrong" campaign, which launched in 2009, has raised over $300,000 for a school in Haiti; launched in early 2010, his "Haitian School Initiative," helped provide temporary schools for Haitian children affected by the January earthquake.)

PHOTOS: Who all has Jennifer Aniston dated?

To help children worldwide reach their potential, watch this funny clip with Stiller and Aniston now -- and check out


Stylish Besties

Jen and Justin's Lei Over & More Couples News

Katy Perry Scares Her Fans and More Funny Pics