There is growing speculation The Duke of Cambridge and his brother Harry could be at the society wedding of one of their best friends in Northumberland this weekend.
Thomas van Straubenzee, 30, is marrying Lady Melissa Percy, 26, who is Duke of Northumberland's second daughter, in the parish church next to her family's ancestral home in Alnwick on Saturday.
The groom is a long-time friend of both Prince William and Harry, and the brothers were at the chartered surveyor's London stag do earlier this month.
Mr van Straubenzee travelled to New Zealand with William on a gap year and was reportedly on the phone to Harry when he was mugged in London last year.
It was said that Harry alerted police and went out to find his friend after the ordeal.
There was no official confirmation that the brothers would attend, with wedding organisers refusing to discuss the matter. It could be that work commitments may mean they cannot be there.
There was also speculation that the Duchess of Cambridge may attend, although she is due to give birth next month.
She carried out her last public engagement at Trooping the Colour last weekend.
Her sister, Pippa Middleton, attended the 2011 wedding of the bride-to-be's older sister, Lady Katie, to Patrick Valentine, which was also held at St Michael's Church in Alnwick.
Ms Middleton is a friend of the Duke of Northumberland's son, Earl George Percy.
Chelsy Davy, who dated Harry, will be among the 500 guests on Saturday.
The bride will leave Alnwick Castle - which has doubled as Hogwarts in the Harry Potter films - in a restored horse-drawn carriage that is almost 200 years old.
She will wear a Bruce Oldfield dress with flowers by local florist Caro Dickinson, who has also decorated the church and castle.
Lady Melissa, who is a tennis coach, will be attended by her sister and Ms Davy, as well as 12 pages and bridesmaids.
After the 5pm service, a reception will be held in the castle's State Rooms, followed by dinner in a marquee.
There will be fireworks in the evening which the public can watch from the Pastures below the castle.
Soon after the wedding, Lady Melissa's dress will be displayed alongside her sister Katie's wedding dress in The Coach House at Alnwick Castle.