America's biggest magazines have launched a bidding war over the first photograph of Angelina Jolie and Brad Pitt's twins - and are willing to pay up to $15 million for the exclusive snaps.

The Tomb Raider star and longtime partner Pitt are currently expecting twins - their fifth and sixth children.

And according to TMZ.com, magazines People and Ok! are desperate to land the first exclusive shot of the twins.

A spokesman for People says, "We'd love to see the photos in People. We wish the family well".

Meanwhile, Ok!'s representative admits the publication would be "foolish" not to bid for the photos.

In 2006, the couple offered the first pictures of daughter Shiloh through distributor Getty Images. People magazine paid more than $4.1 million for the North American rights, while British magazine Hello! obtained the international rights for $3.5 million. All profits were donated to an undisclosed charity by Jolie and Pitt.