Billie Piper has revealed that she may never decide to marry boyfriend Amadu Sowe.

The Doctor Who actress is taking a cautious approach after tying the knot with Chris Evans at age 18.

"I don't know if I will ever be Mrs Amadu Sowe," she told The Mirror. "I'm going to have a few years not being married."

Piper added that Evans wants to write the foreward for her upcoming autobiography.

She explained, "As soon as he heard I was writing it he said: 'I've got this great idea for the foreward.' I'll have to vet it though!"