Photos by Kevin Lamarque / Reuters, Charles Dharapak / Getty Images
Well, if reuniting First Lady Mrs. O and the Queen weren't exciting enough, let's throw Kate Middleton (make that Catherine, Duchess of Cambridge) into the mix! Oh my goodness!
For this historic occasion, Mrs. O has chosen a delightful dress. The mint hued floral frock is the gorgeous work of Barbara Tfank, from the designer's Resort 2011 collection, seen here. A pink cropped swing jacket also by Barbara Tfank and jeweled brooch complete the look.
A note on Catherine: Grazia UK reports that the Duchess wears the Shola Bandage Dress from high street retailer Reiss. More on the dress, here.
Update: On the jewelry front, Mrs. O wore Phillips Frankel amazonite and ruby earrings available at Fragments in New York. The pin is a 1940s Hobe brooch from House of Lavande.