The star, who was fourth months pregnant at the time, channelled Old Hollywood glamour in the shoot

"We'd originally planned to shoot the campaign in October or November but we decided that the minute she got back from touring would be the best window of opportunity."

"It was okay. The way we shot it, you wouldn't know. We weren't going for full-body shots."

For her part, Christina said: "Working together on this campaign and collection has been an incredible experience. I am honoured to be a part of it all."