'Mahna Mahna': The Muppets & Celebs Sing Along (VIDEO)

Without question, Kermit and his felt friends are the true stars of "The Muppets," and the world is super geared up to see all their singing, dancing and laugh-a-minute antics when the film hits theaters this week. But human celebrities have always been an important part of the Muppets' performances, from the first episode of "The Muppet Show" up through all of their previous films, and this new flick is no different.

This time around, Jason Segel, who co-wrote the film, and Amy Adams will be the featured human stars, but there are plenty of more big Hollywood names that will grace the screen in smaller roles. Rashida Jones plays a begrudging TV network executive, while Neil Patrick Harris, Sarah Silverman and many others have cameos.

Just like all of us, they couldn't help but get swept up in the Muppet madness, and this musical montage is great, fun proof.

Mahna mahna!