With her "Dirrty" image behind, Christina Aguilera has again turned to Old Hollywood for inspiration.

The singer has channelled "Hitchcock Heroines", including the likes of The Birds leading lady Tippi Hedren, Rear Window star Grace Kelly and North by Northwest's Eva Marie Saint, in a new campaign for Stephen Webster jewellery line.

With her peroxide-blonde coiffed hair, lashings of lipstick and doe-eyes, the star, who gave birth to her first child Max in January, is at her glamorous best in the new advertisements.

 Christina Aguilera in a new ad campaign for Stephen Webster jewelry

The pop star was four-months pregnant when she posed for the shoot.

Webster has revealed: "We shot it in August. I got a call from her when she was on her world tour in Korea, and she told me she was pregnant."