Don't have a cow, man! The Simpsons will appear on postage stamps.

America's most enduring (or is that endearing?) dysfunctional family will be honored on their own stamps, the U.S. Postal Service has announced.

It's been 20 years since Homer, Marge and family invaded the airwaves on Fox television, and the Postal Service said it plans five stamps featuring the couple and their offspring, Bart, Lisa and Maggie.

No word on their dog, Santa's Little Helper. And it seems that even (or is that evil?) Mr. Burns was not able to pull enough strings to get his own stamp.

Artwork for the 44-cent stamps was done by Simpsons creator Matt Groening and will be available for preview April 9 at the USPS Web site.

At that time the post office plans to announce the date the stamps will go on sale.