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The Twitter world was buzzing last week after news broke that first lady Michelle Obama had jumped on the social media bandwagon. The timing of @MichelleObama's decision to join Twitter perfectly coincided with the announcement that she'd be making a cameo on Nickelodeon's iCarly.

"There are some big iCarly fans in our household, so we're all pretty excited about today's event with military kids and the cast," she tweeted on Jan. 13.

Exclusive Video: Get your first look at the iCarly special "iStill Psycho"

"iMeet the First Lady: A Very Special Visitor" premieres Wednesday at 7:30/6:30c on Nickelodeon. In the episode, Carly (Miranda Cosgrove

) learns that her father, who's in the military, won't be able to return home for her birthday. But she quickly cheers up when she receives a special visit from Mrs. Obama, who thanks Carly for being supportive during her father's deployment.

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After joining the social networking site just six days ago, Mrs. Obama has already amassed nearly 400,000 followers.Below, check out our interview with Miranda Cosgrove, as she talks about her experience filming with the first lady: