Royal watchers believe Prince Harry and his girlfriend Cressida Bonas may announce their engagement this year. Miss Bonas accompanied the 29-year-old prince to two official engagements in the past few days, complete with very public displays of affection.

They have previously avoided being photographed together, so must know that these appearances will only increase speculation that their relationship is getting more serious.

Now it is rumoured that Harry will take her to Balmoral in Scotland this summer to meet the Queen. The 25-year-old daughter of 1960s model Lady Mary Gaye Curzon and Old Harrovian businessman Jeffrey Bonas, will need the 87-year-old monarch's approval before joining the royal family.

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Cressida Bonas gazes at Prince Harry before England's Six Nations rugby match against Wales at Twickenham on March 9, 2014Reuters
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Prince Harry and Cressida Bonas sit together during the We Day UK event at Wembley ArenaReuters
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Cressida Bonas heckles Prince Harry as he speaks at the We Day UK eventGetty
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Prince Harry speaks at the We Day UK event at Wembley ArenaGetty
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A change of hairstyle for Cressida at the We Day UK eventReuters
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Cressida Bonas attends We Day UK, a charity event to bring young people together, at Wembley Arena on March 7, 2014Getty
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Cressida Bonas holds a book entitled Why Love Matters as she attends a Christmas carol concert in aid of the Henry van Strauzenbee memorial fund at St Luke's Church in London on December 4, 2013Getty
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Cressida Bonas attends the wedding of Melissa Percy and Thomas van Straubenzee at Alnwick Castle on June 22, 2013Getty
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Cressida was part of Princess Beatrice's team for the Virgin London Marathon on April 25, 2010Getty