updated 05/11/2012 AT 2:50 PM ET
•originally published 05/11/2012 AT 3:15 PM ET
Let the (glamour) games begin!
Kate, 30, donned a teal Jenny Packham floor-length gown and wore her hair up at the event – called Our Greatest Team Rises – which raises money to back Great Britain’s team at this year’s Games.
Kate and William (and his brother Prince Harry) are ambassadors to the British Olympic delegation and the British Paralympics squad.