Popstar to Operastar judge Katherine Jenkins has admitted that she did not think she could act before she was cast in the upcoming Doctor Who Christmas special.
The classical singer revealed that she was given support by her co-stars Matt Smith and Michael Gambon.
She told the Radio Times: "I've not done any acting before, so I wasn't sure if I even could.
"But I read for the part and on my 30th birthday, they called to say I'd got it."
Katherine added: " Matt Smith and Michael Gambon have been really encouraging. I can't wait to see the results."
Jenkins admitted that she watched Gambon's acting technique throughout filming.
She said: "I learned so much from simply watching Michael Gambon, and he was always telling great stories about all the actors he's worked with. Matt and I would sit and listen to him for hours."
The Doctor Who Christmas special will air on BBC One in December.
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