Pippa Middleton, the sporty young sister of Britain's Duchess of Cambridge, made an appearance Wednesday at Wimbledon on the arm of her sometime boyfriend, Alex Loudon.

Middleton wore a cao-sleeved, reddish dress, tan flats, and sunglasses, while Loudon sported light trousters and shirt, topped off with a striped blue tie and navy blazer. Pippa's dress appeared to be the same one she wore the previous day, sparking rumors that she did not return home overnight, the New York Post reported.

Her parents also attended the tennis tournament Wednesday.

The Duke and Duchess of Cambridge - who will depart Thursday for their first overseas tour to Canada and California - attended the tennis championships Monday, sitting in the royal box as they cheered British hopeful Andy Murray on to victory against France's Richard Gasquet.

Pippa Middleton, Sister of Catherine, Duchess of Cambridge
The sister of Catherine, Duchess of Cambridge, Pippa Middleton, sits on Centre Court at the Wimbledon tennis championships in London June 29, 2011. REUTERS
Pippa Middleton, Sister of Catherine, Duchess of Cambridge
The sister of Catherine, Duchess of Cambridge, Pippa Middleton, sits on Centre Court for the quarter-final match between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the Wimbledon tennis championships in London June 29, 2011. REUTERS
left Parents of Catherine, Duchess of Cambridge, and Her Sister, Pippa Middleton
The parents of Catherine, Duchess of Cambridge, Michael (left) and Carole Middleton (2nd left), and her sister Pippa (3rd left), sit on Centre Court for the quarter-final match between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the Wimbledon tennis championships in London June 29, 2011. REUTERS
left Parents of Catherine, Duchess of Cambridge, and Her Sister, Pippa Middleton
The parents of Catherine, Duchess of Cambridge, Michael (left) and Carole Middleton (2nd left), and her sister Pippa (3rd left), sit on Centre Court for the quarter-final match between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the Wimbledon tennis championships in London June 29, 2011. REUTERS
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