Newlywed Carrie Johnson, Dr Jill Biden and Brigette Macron were treated to a performance of Ocean World and chatted to performers at the picturesque seaside venue.
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Carrie Johnson swapped the blue power suit she wore earlier for a blue floral dress, which she teamed with metallic flats for a barbecue in Caribs Bay with G7 leaders and their partners.
Kate Middleton and First Lady Jill Biden are set to host the seminar in Cornwall later today as the G7 summit gets underway this afternoon, the first time Kate, with husband William, has attended.
The US First Lady, 70, seemed a natural counterpart to the 33-year-old mother of one, and the pair were seem smiling together in Carbis Bay for the G7 summit.