Eva Longoria is obsessed with “working on her butt”.

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The Desperate Housewives star revealed she sticks to a special exercise regime to maintain her pert derriere.

She said: “I love doing squats in the gym. When I do them my butt beefs up and I fill out my jeans better. I’m constantly working on my butt because of, you know, gravity.”

The 33-year-old actress – who married basketball star Tony Parker last July – fears it will become harder to keep her bottom in trim after she has had children.

She said: “I’m nervous about what’s going to happen back there when I have children. I’m full of fear. I don’t want anything happening to the butt.”

Eva has frequently expressed her desire to start a family. She previously said: “I’ve always loved the idea of having lots of children. If I’m around any baby, I’m like, ‘Aaaaahhhh, babies!’

“I was pretty ambitious when I moved to Hollywood and I succeeded. But now I’ve found new ambitions – I want to work, I want to be a great wife and I want to have children.”