It's time for the battle of the fat asses....

In this corner weighing in at one ton... gossip blogger Perez Hilton.

In this corner weighing in at 1.5 tons... bratty rich kid Jason "Gummy Bear" Davis.

The sad thing is -- it's a real battle.

Perez Hilton has challenged Gummy Bear to a duel of the fat kids.  Perez challenged Jason to a race and hot dog eating website on his blog Wednesday afternoon.

If you're in LA with nothing better to do, here's the 411:

When:  Thursday, July 19th at 5 PM

Where:  Kitson on Robertson Blvd., Los Angeles

What:  Two pigs in a blanket

TMZ's Harvey Levin has agreed to officiate, if Davis agrees.

This could be funnier than we ever expected!