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Jennifer Lopez has made a career in TV, film and music by blazing trails for others to follow, and today she leads off the First Annual Entertainment Tonight Power List.

VIDEO: Jennifer Lopez Shares Her First World Tour Jitters

The Grammy and Golden Globe nominee, who is now on her first world tour, granted ET exclusive backstage access at her concert in Istanbul, Turkey, and participated in our Power List Quiz.

On the best advice she's ever gotten, JLo quotes her mom, who told her, "Listen, you better toughen up if you're going to be in that business."

"She was right," says JLo, who made $52 million in one year, according to Forbes. "You gotta be tough."

Watch the video to find out the most surprising song on JLo's iPod. And tune in to ET tomorrow night to find out who else made the Power List.