Samantha Cameron in an amazing (although perhaps a tad too informal) Alessandra Rich belted lace dress, and Michelle Obama in Marchesa with a Tom Binns necklace
SamCam in a wonderful color block dress by Roksanda Ilincic, and Michelle in a Zac Posen suit (a nod to Camilla and Kate?).
Sam in Roksanda Ilincic
Michelle being awesome