Watson, who plays Hermione Granger in the Potter films, was snapped in the company of at least three young men.

Her admirers included Italian actor Roberto Agnillera, a friend from RADA with whom she sat in the royal box to watch the match; 

Michael Walker, an 18-year-old who has just left Eton and is waiting to find out if he has won a place at Cambridge University

And Francis Boulle, a philosophy student at Edinburgh University.

Boulle, 19, was seated next to Watson at lunch and said afterwards: “She was very sweet and we had a lot in common.”

Watson, who wore a demure cream dress, has become one of London’s most sought-after party guests of late.

She is reported to be dating financier Jay Barrymore, and has been linked in the past to Razorlight singer Johnny Borrell.

Her latest film, Harry Potter and the Half-Blood Prince, is released in November, and she will make her final appearance as Hermione in the last JK Rowling adaptation, Harry Potter and the Deathly Hallows. The final book is being split into two parts, to be released in 2010 and 2011, because the plot is too lengthy to be compressed into one film. They will reunite Watson with Daniel Radcliffe, who plays the schoolboy wizard.

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