The singer-and-actress gave birth to twins Max and Emme in February 2008 and while she was expecting the babies her feet went up a size and she admits they've never fully recovered.
She said: "I was surprised that my feet went up a size. I was like, 'What am I going to do with all these great shoes.'
"They went back, almost, but not all the way. It's just like your ribs. Like, I used to fit into the sample size, now they have to open up the hips a little bit for me."
However, the 'American Idol' judge - who split form the twins' dad, Marc Anthony, last July - says she loved every minute of pregnancy and now thrives on being a mother.
She told OK! magazine: "I had a really ideal pregnancy. I was on tour until I was six-and-a-half months pregnant. I didn't really blow up until I was like eight-and-a-half months. I remember having one moment of panic sitting in the living room and it just hot me that I was going to be responsible for two other human beings, and for one second you think you can't do it. But then when you have kids every day, they just bring so much joy and happiness to your life. They just bring you right back down to earth."