Kirsten Dunst is at the centre of a pregnancy riddle.

The stunning actress and long-term boyfriend Jake Gyllenhaal have sparked rumours they could be expecting a baby after they were seen looking at pre-natal vitamin supplements in a Los Angeles supermarket.

The star couple were spotted examining a box of New Chapter Organics

Perfect Pre-natal pills in Hollywood's Whole Foods market last weekend, according to America's In Touch Weekly magazine.

Onlookers claimed they even asked a member of staff about the benefits

of the vitamins, which New Chapter say increase physical stamina and aid emotional well-being.

Kirsten and Jake, who recently laughed off wedding rumours, were reported to have split last year.

But it was later revealed the pair had concocted stories of a break-up to take the heat off their relationship.

The Hollywood couple started dating after being introduced by Jake's actress sister, Maggie Gyllenhaal, who co-starred with Kirsten in 'Mona Lisa Smile'.

Jake recently confessed his love for Kirsten, saying: "She's the only girl for me."

Kirsten, who has previously dated her 'Spider-Man' co-star Tobey Maguire, also appeared to be smitten, saying: "I am really happy and in love."

Source: Press Release