• Pippa Middleton watches the men's singles tennis final between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the ATP World Tour Finals at the O2 Arena in London November 27, 2011.

Pippa Middleton watches the men's singles tennis final between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the ATP World Tour Finals at the O2 Arena in London November 27, 2011. (Photo : REUTERS/TOBY MELVILLE)

Pippa Middleton surely knew how to grab attention as she showed off her mid-riff at the recent Boodles Boxing Ball on Sept. 12.

Just a few days after her completion of the taxing 47-mile swim-run competition, she braced the London charity event, hosted by Gordon Ramsay. The results of her intense training were evident, her well-toned arms and shoulders complemented her dress well.

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According to pictures released by Express, Middleton's gown included a halter neck with a bandeau-style bust, embellished with a flower appliqué and a mid-riff cutout. The outfit had a belt at the waist and revealed a bit of her back. She wore her hair loose and kept the make-up minimal.

The younger sister of the Duchess of Cambridge Kate Middleton attended the annual charity event at the Grosvenor house hotel with her friends that included Tom Kingston and Prince William's buddy Hugh van Cutsem.

The host and hostess of the event, Ramsay and his wife Tana looked elegant in their respective outfits. Ramsay, the celebrity chef, donned a dapper look in a blue color suit, coupled well with a white shirt and black tie. Black lace-up boots gave a fine finishing touch to his overall look. Tana wore a pretty black dress without sleeves that included a low-cut neckline. She adorned glossy brown brunette tresses in curls and applied moderate make-up: lip gloss, pink manicure and black eyeliner.

This is the year when Pippa was the only member from the extended Royal family to attend the annual Boodles Boxing Ball event. Earlier, Prince Harry, Prince William and Kate have graced the occasion. Middleton's long time boyfriend Nico Jackson was absent from the event, Independent reported.