J.Lo at 40: How a Diva Was Made!

In 40 photos, see how the birthday girl (on July 24) went from Jenny from the Block to superstar

UNDER COVER

A few days later, Lopez arrives to the Late Show with David Letterman hiding her figure in a heavy coat. Although Letterman avoids grilling Lopez about whether or not she's pregnant, he does ask her if she would practice tough love like her mother Guadalupe. "If I can be as great a mom as she is," Lopez responds, "then I will be alright."