Jenkins joined TV presenter Natalie Pinkham at the event in Ascot wearing a Fifties-style polka dot print dress paired with wedges and a matching clutch. Just in case the plunging design wasn't enough of a head-turner, KJ completed her look with her signature blonde curls and a classic red lip colour.
So - the perfect outfit for hanging out in the players' lounge? Katherine and Natalie were spotted en route to find Prince Harry later on in the afternoon, as seen below:
We're not sure what Natalie's so pleased about, but something tells us that a visit from Katherine would have made Harry a very happy polo player indeed.
More of the singer below: