Bisexual Barrowman, who plays Captain Jack in the time-travel BBC1 drama, insists the affair will be short and simple, and will not be called a 'marriage'.
He says, "We're just going to sign the civil register. We're not going to have any ceremony because I'm not a supporter of the word marriage for a gay partnership."
Barrowman and his architect partner also plan to have a baby together, with the help of a female friend.
He adds, "The daughter of a very, very old friend offered to carry a child for us. I've known her since she was five or six.
"She has kids of her own but said that if we wanted a child she'd be happy to do it."
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