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"It’s going to be a strange interview, cringe-worthy even," a source told The Sun. "Chris knows everything about Billie - but then she knows everything about him too. If he asks her anything too controversial she could come back with a real dig at him.
"I think he will steer clear of any sex questions in case he implicates himself in any way. I imagine it’s going to be more of a love-in than a warts-and-all chat. It shows how supportive Billie is of him, agreeing to do the show.
"But she’s terrified he might try to slip in the odd embarrassing question to trip her up. The show is live so anything could happen."
The Doctor Who actress is currently dating student Amadu Sowe.
