When a famous actress has a baby on the way, every eye tends to be on her bump.

But in Angelina Jolie's case, her arms attracted all the attention.

While the 32-year-old looked the picture of glamour in bright yellow dress and over-size shades, the rope-like size of her veins startled fellow-diners at a Hollywood restaurant.

Miss Jolie is thought to be six months pregnant, possibly with twins, by her partner Brad Pitt.

Her body-builder-style veins are believed to be the result of her punishing exercise regime.

Dr Chris Steele, resident GP on ITV's This Morning, said: "Prominent veins in the arms means there is very little fat under the skin, which is not something you would expect during a pregnancy.

"We are more used to seeing it on athletes, sports people and those that exercise heavily because they have very low body fat.

"Women do get varicose veins in their legs when they are pregnant, because the weight of the baby is on the legs."

Miss Jolie is a self-confessed fitness fanatic and has often trained intensively to perform her own stunts for films such as Tomb Raider.