It's hard to believe the beautiful Jennifer Lopez turns 40 today. The mother of 17-month-old twins Emme and Max still looks fresh faced and youthful. Motherhood has definitely served her well.

Are there plans for more children in her future? Recent photos showed Lopez with a baby bump, but she was only wearing a prosthetic baby belly for the filming of her upcoming movie The Back-Up Plan.

In addition to "The Back-Up Plan," Jennifer will be starring in The Governess as a thief who has a crisis of conscious after posing as a nanny for a well-off family with whom she falls in love with. There's no slowing down for this pop star/actress!

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