Brad Pitt tells Angelina Jolie to get a live-in nurse

Brad Pitt has told pregnant Angelina Jolie that she needs a live-in nurse.

The Hollywood hunk, fears that Angelina - who is widely reported to be pregnant with twins, and is refusing to ease her hectic work schedule - could run herself into the ground if she doesn't seek help to monitor her health & assistance in looking after the couple's four children.

Jolie, 32, is believed to be around 4 months pregnant; she is yet to confirm the reports, but she did turn up to an awards show last month sporting a visible baby bump.

Jolie is keeping the baby news a closely guarded secret - even from her friends and family - because during her first pregnancy, she was very ill over the first few months.

A source sad: "This time around [the pregnancy] has been even worse.

"She has struggled through the first three months feeling more exhausted than she she ever did when she was expecting Shiloh, even though she was just as busy as she is now.

"She thought that once the three-month mark had passed she'd get some of her energy back, but she's still feeling sick and dizzy.

"She also can't shake off this overwhelming tiredness and is asleep on the couch before the older children have gone to bed.

"Brad's trying to get her to rest more - because when she's working she puts so much pressure on herself and doesn't like to let people down.

"They've got a live-in nurse now, who moved in a month ago.

"She'll be making sure that Ange eats healthy and will help look after the children - one or other of them is always waking up in the night or getting up early in the morning.

"Brad also wants to make sure Ange doesn't try to lift the kids out of the bath and do heavy-duty things if he's not there.

"They're both normally so hands on with them."

The news comes as Angelina took son Maddox out for a ride in a private plane Tuesday.

The 'Tomb Raider' star piloted a private plane with 6-year-old Maddox - who she adopted from Cambodia in 2002 - in an air field in Smithville, Texas. Pitt is currently shooting new film 'Tree of Life' in the area.

Jolie earned her pilot's license in 2004.

The American College of Obstetricians and Gynecologists recommends that moms-to-be not fly after their 36th week of pregnancy. Jolie, however, is far away from the 36-week mark.