Jessica Alba refuses to leave her four-month-old daughter while filming new movie An Invisible Sign of My Own.

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The 27-year-old actress – who welcomed Honor, her first child with husband Cash Warren, into the world in June – is finding it difficult to leave her daughter when she goes to work.

She told People magazine: “To be honest with you, it’s tough – and if it was any other movie I wouldn’t be doing it. It’s difficult to spend any time away from her.

“I love my daughter and she’s going to be with me every day on the set.”

Jessica plays a mathematics teacher who helps troubled young students in the new movie, which also stars Mackenzie Milone.

The stunning star recently revealed becoming a mother has given her life new meaning.

She said: “So far, motherhood is the best thing ever. It is exhausting but way more fulfilling than anything I have done. Everything I do now is so much more meaningful because of her.”