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What do Ashlee Simpson, Eva Mendes, Puff Daddy Diddy, Anthony Kiedis, Michelle Trachtenberg and Ioan Gruffudd have in common?

They all stopped by Ammo restaurant in Hollywood yesterday afternoon to record a message for President Obama!

The stars remained tight lipped as they entered and exited the eatery, and Ammo was quick to say they would not be interested in offering any details on the shoot, nor were they interested in any publicity at all. Aww, but it's for a good cause!

Check out the gallery below to see who else showed up!