Claudia Winkleman, Dara O'Briain, Dermot O'Leary and Gary Linekar also transformed themselves into creepy characters for the spooky event at the ITV chat show host's home in Hampstead, London. Click on the photo below to see the celebrities donning their best fancy dress.
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As usual, their host had thrown himself into the preparations. His property had been converted into a ghoulish castle, featuring cobwebs and gargoyles on the exterior walls.
And as the witching hour drew closer, Jonathan emerged dressed up as Jareth from the 1986 fantasy film Labyrinth — a role played by his idol, David Bowie.
Supermodel Kate and her husband Jamie Hince paid tribute to Mexico's Dia de Muertos national holiday, arriving dressed as skeletons as they embraced the cultural theme.