Jennifer LopezJennifer Lopez admits she's a totally different person since giving birth to twins, 18-month-old Max and Emme. "It totally changes your perspective on everything. There's nothing as huge as giving birth to another human being and having to be responsible for another life," Lopez said.

"There's you before kids, and there's you after kids -- and they're not the same you. You don't come first anymore. There's somebody else you care more about than yourself," she told InStyle.