Their flirtatious fling first starts in Prisoner of Azkaban, when they play head to head against each other in a Quidditch match.
In the same year Hynes appeared in the film Faintheart and in a revival of Alan Ayckbourn's The Norman Conquests at the Old Vic.
The presenter left nothing to the imagination as she got nude for a charity calendar in aid of Autism Cymru back in 2005.