Princes' old friend Thomas van Straubenzee has wed Lady Melissa Percy in an extravagant ceremony
A smartly-dressed Pippa Middleton among guests arriving at St Mary's Church, Alnwick
Princesses Beatrice and Eugenie also among the congregation
By KERRY MCDERMOTT and ANNA EDWARDS
The Duke of Cambridge and his brother Prince Harry arrived in Northumberland today for the wedding of their old friend Thomas van Straubenzee and society bride Lady Melissa Percy.
Excitement was mounting in Alnwick as the princes arrived in the sunshine ahead of this evening's lavish ceremony.
Prince Harry's ex Chelsy Davy (right) - as she makes her way into St Mary's Church in Alnwick
Crowds gathered to see Lady Melissa Percy in her billowing white gown that was embellished with lace, and waved as her beaming bridesmaids - including Prince Harry's Zimbabwean ex-girlfriend Chelsy Davy - walked through the town.
Dessed in pale espresso floor-length gowns and clutching bouquets, the bridesmaids helped the excited-looking bride with her full dress, which was whipped up by the north east winds.
Prince Harry and his new girlfriend, Cressida Bonas
Pippa Middleton, resplendent in a patterned peplum dress with co-ordinating hat and heels, was greeted at the church gates by cries of 'beautiful' from the crowd.
Princesses Beatrice and Eugenie are also among the Royal contingent at today's ceremony. The sisters - Beatrice wearing blue and Eugenie in green - were spotted hugging other guests at the gate before walking into the picturesque church.
Society girl Cressida chose a blue and white maxi dress, which she teamed with a blue sequinned jacket and a cream flower in her hair.
The sprawling Alnwick estate has doubled as Hogwarts School in the Harry Potter movies.
A snap of William apparently arriving last night at nearby Alnmouth railway station has been circulating on Twitter.
The Duke of Cambridge was without his heavily pregnant wife Kate, but there were still plenty of glamorous female guests in attendance - including her sister Pippa Middleton, Prince Harry's girlfriend Cressida Bonas, Princesses Beatrice and Eugenie, and Holly Branson.
The Duchess of Northumberland, mother-of-the-bride, told The Journal newspaper ahead of today's ceremony: 'We are really excited.
'The weather forecast is not great but Melissa and Thomas do not seem to mind. Whatever the weather it is going to be a wonderful day.'
Lady Melissa is a 26-year-old tennis coach while the groom is a chartered-surveyor and long-time friend of both William and Harry.
Prince Harry braves the rain, while his girlfriend Cressida Bonas...
Prince William and his brother's ex-girlfriend, graduate Chelsy Davy, gathered together to applaud the newly weds
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