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In a separate clip, Cat leaned forward wearing pyjamas while her comedian husband applied the dye to the underside of her hair.
She filmed the video with a pink love heart filter and asked her husband, who also celebrated his 50th birthday on Sunday, if this was how he expected to spend his birthday.
Home salon: The TV presenter, 44, shared a hilarious video to her Instagram story, joking that 'Fernando', aka Patrick, 50, was about to open his salon
Patrick turned to the camera, joking: 'I mean, it's probably the greatest birthday I've ever had - especially with that filter.'