Natalie Portman is now a married woman, according to a jeweller who designed rings for the star and her partner.

The Jerusalem-born actress sparked rumours after walking the red carpet at Sunday's Academy Awards with a ring on her finger.

The 30-year-old, who won the Best Actress Oscar a year ago for her role in Black Swan, has not confirmed the speculation.

But jeweller Jamie Wolf told Us Weekly magazine that the ring was indeed a wedding band, designed for the actress to match one made for her purported husband, choreographer Benjamin Millepied.

The couple met on the set of Black Swan and have a seven-month old son called Alef.

Ms Wolf told the magazine: "The rings were made with recycled platinum and conflict-free diamonds."