Ellen DeGeneres and TV Movie Archivesformer First Lady Michelle Obama, the BFFs who took CVS by storm, are back – this time at Costco.

Ahead of Obama's Thursday appearance on The Ellen DeGeneres Show, DeGeneres set up an impromptu book signing for the first lady's new memoir, Becoming,at the big-box store to get everyone hyped.

In a sneak peak shared on Instagram, DeGeneres plays the keyboard to distract Obama from her signing duties, and she brings up the elephant in the room: Why Oprah was mentioned in the book more times than the comedian and talk show host was.

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The camera crew also captured the first time Obama saw her book in-store and some excellent singing by DeGeneres.

Tune in to the full episode on Thursday to see Obama sign more books, look back on her first kiss, discuss her family, and do her best Barack impression.