Kate, 35, looked sensational in the white and black print dress, which featured a three quarter length sleeve.
The dress also boasted a square neckline and came down to just about the Duchess’ knees.
She paired the dress with a structured white bag and low heeled open toe strappy sandals.
As well as her engagement ring, Kate also wore a pair of pretty pearl earrings for the day.
Kate wore her thick brown hair in large curls and a side parting.
Her hair looked much shorter than usual, and it seems the Duchess has had a haircut, losing several inches.
Kate is famed for her bouncy, luscious hair, and while it is shorter at the moment, it is sure to grow back quickly.
Ahead of any games starting, the Duchess met with servicemen and women at the All England Lawn Tennis and Croquet Club in Wimbledon, south London.
Last week, all eyes were on the Duchess of Cambridge as she wore a stunning Gucci mini dress for an appearance at the V&A Museum in London.
Prince William’s wife chose a tweed Gucci number for the occasion.
The Duchess of Cambridge arrived at the Victoria and Albert (V&A) Museum to officially open a new entrance, courtyard and exhibition gallery on Exhibition Road.
Kate’s designer dress costs £1,790 on Net-a-Porter.
The grosgrain-trimmed cotton-blend tweed mini has a monochrome pattern with red lining.
With a hemline that cut off above the knee, the outfit showed off the Duchess’s long slim legs.
Kate paired her dress with black round toe high heels and a bright red clutch bag.
The mum-of-two wore her hair down for the occasion, with a clip sweeping her tresses back off her face – perhaps a clue that she was planning to cut several inches of her hair off shortly after this appearance.