Today marks the Duke and Duchess of Cambridge's 10 year wedding anniversary, and across the globe, well wishers are congratulating the royal couple by sharing throwback snaps from the big day.
But one photo of the pair kissing on the balcony of Buckingham Palace has caught the attention of some fans, after a mysterious person was spotted in the background.
The photo - which also included the three-year-old flower girl who became an internet sensation for frowning and covering her ears on the day - was shared on Instagram.
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And social media users were distracted by the mysterious figure in the background. "Can we talk about the creepy black shadow in the background though?" One person wrote.
Of course, it could well be a wedding guest in the background, standing inside the palace as opposed to outside on the balcony.
In fact, on closer inspection, you can see quite a few people standing in the doorway, presumably members of staff or close friends and family.
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So is it a ghost or a lurking member of staff? We'll leave that one up to you to decide.
Today, Kate and Will released a pair of heart-warming new photographs to mark their special anniversary.
William, 38, and Kate, 39, look more loved-up than ever as they posed intimately for two pictures taken by British photographer, Chris Floyd.
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In one sweet image, William can be seen looking lovingly at Kate, while she holds his hand. Meanwhile a second sees Kate cuddling into her husband as the pair laugh together.
Kate and Will were married on 29th April 2011 at Westminster Abbey after meeting as students at the University of St Andrews.
The wedding was watched by 17.6million viewers on television and Kate wore a dress designed by Sarah Burton, creative director at Alexander McQueen.
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The couple now have three children together - Prince George, seven, Princess Charlotte, five and Prince Louis, three.
Happy 10th Wedding Anniversary to the Duke and Duchess of Cambridge!
Topics: Celebrity News, prince william, Kate Middleton, Royal Family