Pop star Jessica Simpson wants to follow in Angelina Jolie's footsteps and adopt a baby. The THESE BOOTS ARE MADE FOR WALKIN' singer has been so impressed with the Oscar winner's humanitarian work, she will pledge her support to needy orphanages in the future. She says, "I think Angelina Jolie has done amazing things. The international adoption rate has skyrocketed (since she adopted her children MADDOX and ZAHARA). "I want to adopt before I actually have my own kids. I want three kids - but I don't know if I can give birth three times. We have to see how much pain is involved first! "Ever since I was a kid I said I wanted to save the world somehow. I didn't know how. I think I'll end up doing things that can touch somebody in some way that's good - like through orphanages."