Angelina Jolie's twin pregnancy

Angelina Jolie is pregnant with twins, it has been claimed.

The 'Beowulf' actress and her lover Brad Pitt discovered the happy news earlier this week and hastily cancelled their planned trip to Europe.

A source told America's Star magazine: "Brad and Angelina are absolutely ecstatic. But I still think there will be more adoptions to come."

Angelina, 32, gave birth to the couple's daughter Shiloh in May 2006 in Namibia.

The star also has three adopted children with Brad - six-year-old Cambodian son Maddox, four-year-old Vietnamese son Pax and three-year-old Ethiopian daughter Zahara.

Pregnancy rumours first surfaced earlier this month when Angelina refused alcohol at the Critics' Choice Awards and was said to be planning her work schedule around having another baby.

The 'A Mighty Heart' star has previously spoken of her desire to expand her brood, saying: "Brad and I would like to have more kids.

"I've always wanted a big family. And Brad's the same. We are enjoying the children together. They are such big personalities, and it's so exciting to watch them grow up."

Angelina's representative has refused to confirm the pregnancy reports, saying: "I am not commenting on unsubstantiated rumours."