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The actress/singer admits she was nervous about appearing alongside Barack Obama's wife - but the president's partner soon put her at ease during a fun dancing scene.


Cosgrove says, "I've been doing the show for a long time and I usually don't get nervous, but having the First Lady on the set, I was really nervous.


"(She was a) nice, pretty normal person. (The dance scene) was probably the most fun thing we did. We all just got to let loose and have a good time."


The episode is set to air on 16 January (12).