January Jones found filming Mad Men tough when she was pregnant. The 35-year-old actress - who is mother to 18-month-old Xander, but refuses to name the father - had her baby bump disguised in a storyline which saw her character, Betty Francis, put on weight because she was unhappy, and the beauty says each day's shooting was hard.

"When we started filming, I was quite pregnant and had to come into work at 3am each day for six or seven hours of prosthetic make-up," she explained. January added she was "afraid" of the response to her changing appearance, but found the reaction by fans was even better than she imagined: "I was very afraid of how that first episode would look when it aired, but I loved the audience response to her. When she's bigger, viewers are more sympathetic to her."

This season sees January's alter ego back to her pre-pregnancy figure and the actress loved slipping back into Betty's glamorous outfits. "Betty's style has evolved, not only with time, but also with her role. In the first few years, she was emulating Grace Kelly, whereas now she sees herself as more of a Jackie Kennedy," she told Grazia.