Gwyneth Paltrow turns into an 'a**hole' when trying to help her children do their homework.

Gwyneth Paltrow

Gwyneth Paltrow

The 43-year-old actress - who has daughter Apple, 11, and son Moses, nine, with former husband Chris Martin - finds her usual patient and calm demeanour disappears when it's time for her offspring to do their after-school assignments.

During an interview on KIIS FM's Kyle and Jackie O Show yesterday (22.03.16), Gwyneth said: "Honestly, it is when the worst of my personality comes out. I'm pretty much calm and normal and patient and a nice person but at homework time, I'm such an a**hole."

And Gwyneth finds it particularly tricky getting her son to knuckle down - especially as she doesn't always understand the work he is set.

She said: "It's a combination of their frustration about not wanting to do it but having to do it, especially my son. My daughter is very responsible and she'll just do it but he, there's just a whole process that he goes through. And I don't even understand his maths homework."

Though the 'Iron Man 3' actress - who runs her own lifestyle blog, Goop - was previously known for her macrobiotic diet, she admitted she has relaxed her healthy eating rules now her children are older.

She said: "Luckily they serve lunch at school so that is one thing that is off my plate, thank God. When they go on a field trip, when they were younger it was like 'Oh I'm going to make a little Soba noodle salad and a little wrap' and now, literally, I'm like 'here's a Nutella sandwich'."