11/07/2013 19:01 BST | Updated 22/05/2015 10:12 BST

First Lady Style: Sam Cam Vs Mrs O

It was First Lady Michelle Obama who laid down the sartorial gauntlet during yesterday's official Olympic festivities.

Mrs O looked spectacular in a sculpted white and silver J Mendel top and skirt at a formal reception at Buckingham Palace.

michelle obama

Samantha Cameron, however, stepped up to the fashion plate, in a geometric piece by UK-based designer Roksanda Ilincic for the opening ceremony.

samantha cameroon

Both women looked amazing. We declare the face-off a dead heat. What do you think?

And now for some more Sam Cam style...