Zara Phillips has posed in a tight black jumper and vampish high heels for her first official portrait.

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Zara, Princess Anne’s 26-year-old daughter, showed off her sexy side in the portrait by popular Scottish artist Jack Vettriano, in aid of the Sport Relief charity campaign.

Speaking about Zara – who is pictured reclining on a union jack flag – Vettriano said: “She looked exceptionally sexy. Is it treason for me to say that? I don’t really do portraits so I told them I would only do it if Zara Phillips agreed. To be honest, I never thought she would say yes!

“I love the way she is lying with the Union Jack draped beneath her. I think it is a very sexy and powerful image.”

Vettriano, whose paintings usually sell for more than UKP700,000, will put the 20in by 24in oil on canvas painting up for auction later this year. All proceeds from the auction will go to the Sport Relief charity appeal.

Zara is no stranger to sporting events – having won a gold medal at the World Eventing Championships with her horse Toytown – and is currently training for the Beijing Olympics later this year.