Angelina Jolie struggling with pregnancy

Pregnant Angelina Jolie is struggling to carry her twins - because the babies are so heavy.

The Oscar-winning actress, who is rumoured to be expecting a boy and girl,is finding the burden of having two tots inside her exhausting.

A source close to Angelina - who already has three adopted children, Maddox,six, Pax, four, Zahara, three, as well as 22-month-old daughter Shiloh with partner Brad Pitt - told America's Star magazine: "Her feet are so swollen that her shoes have gone up a half size at least.

"She's constantly tired. She's sick and irritable and feels heavy and weak."

Angelina is also said to be suffering from gestational diabetes, a condition in which women without previously diagnosed diabetes exhibit high blood glucose levels during pregnancy.

An insider added: "Angelina has gestational diabetes. She found out about a month ago and has been trying to keep it under wraps. She's been seeing a nutritionist about it - frequently."

She has now had to change her diet in order to cope with her condition.

Her brother James Haven said: "She doesn't pay much attention to food. But it's different when she's pregnant."

- Bang! Showbiz