Miranda Cosgrove,  Michelle Obama Miranda Cosgrove, Michelle Obama

When it comes to guest stars, it doesn't get much bigger than the First Lady.

In a special episode of iCarly, "iMeet the First Lady," Carly (Miranda Cosgrove) learns that her military father won't be able to return home for her birthday. But she quickly cheers up when she receives a special visit from Michelle Obama herself who thanks Carly for being supportive during her father's deployment.

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"The First Lady watches iCarly with her daughters ... and she came up with the idea to be on the show," Cosgrove tells TVGuide.com in the video below. "She got pretty into it. She has a good sense of humor." Cosgrove and her castmates screened the episode at several military bases around the country, reuniting with the First Lady for the final showing.

Check out the interview below — plus, clips of Obama "random dancing!"

"iMeet the First Lady" airs on Monday at 7:30/6:30c on Nickelodeon.