Kate Middleton might not be happy with her sister after the gun scandal, but the pair who have previously be seen as thick as thieves have not always seen eye-to-eye, especially when Pippa decided to hide Kate's engagement ring.
While the sisters were out shopping with their mother Carole, Kate was given a nasty shock when she thought she'd lost her engagement ring - that previously belonged to Princess Diana.
The family were out shopping at a jewellery store when younger sister Pippa decided to play a prank on Kate.
The owner of one of the family's favourite jewellery stores has said: "Pippa is a little minx. She has a wicked sense of humour."
"Once, all three of the Middleton ladies came into browse, and while Kate Middleton took off her engagement ring - Diana's - to try on another she liked, Pippa sneakily hid it," the source told You magazine.
The sapphire ring was given to Kate when Prince William proposed in 2010, and considering it held such significance the bride-to-be was really upset.
"Pippa let Kate panic for a few minutes before confessing. She found it extremely funny," they said, before adding: "Not surprisingly, Kate wasn't so amused!"
Well, this sounds like another of Pippa's 'jokes' that go wrong - according to the reports, Pippa and her pals thought their recent 'gun' scandal was funny and have claimed that the gun was actually a toy.
Kate Middleton on her wedding day...