Strictly Come Dancing star, 31, took to Instagram on Monday to share snaps with her former partner alongside a series of pals as they celebrated the big day.
The first shot saw Neil smile for the camera with friends as held a giant balloon which read 'Happy Birthday', while another picture saw the gang all pose on a boat as they partied.
Katya also posted some vintage images of her and Neil from their marriage, including a shot of them alongside two pals who appeared to be at a party.
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