Jessica Alba's children help her cook.

The 'Sin City' star - who has Honor, seven and Haven, three with husband Cash Warren - loves having her little girls help out in the kitchen but has admitted it takes ''three times longer'' to do it when they get involved.

She said: ''It always take three times longer when they help, but I try to have them participate in any kind of cooking.

''It's good for them to understand the process of making food, and where it comes from. They are also more inclined to eat it, if they participate in making it.''

Jessica also revealed that away from the oven, her youngest daughter is a fan of building things.

She added to PEOPLE magazine: ''Havey loves making people laugh. She loves building things. She likes blocks and Legos and cars. She likes to race, unless she knows she is going to lose - then she doesn't like to race. She is just really funny. Honor is a little more self aware and poised.''

Meanwhile, the 34-year-old actress recently admitted she can't imagine having anymore children.

Asked if she wants to try for a little boy, she said: ''I'm just happy to have healthy babies and - not right now - I'm busy.

''I'm really busy! I love kids and I love babies, but right now, I can't imagine. It just started to get easy.''