Spears and her husband KEVIN FEDERLINE became the proud parents of Sean Preston four days before their first wedding anniversary, and now the TOXIC singer is receiving tips from the blonde beauties on regaining her figure.
Klum, who gave birth to her second child HENRY just two days before Spears, says, "If you worked really hard before and don't go too crazy, you shouldn't have to work as hard afterward (to lose the baby weight)."
McCarthy stresses patience, explaining, "Most women who come up to me want to know about the weight and what to do to get it off. I tell them patience. (It takes) about a full year before you can fit back into your jeans. Patience."
Meanwhile, Jada Pinkett Smith offers Spears some very basic parenting advice, saying, "What makes a good mother is what works for your child - and every child is different...
"We all think there is a formula, (but) as long as we love our children, that's really the only solid thing I know that works across the board."
And Lindsay Lohan is even more straightforward in her advice for her fellow smoker: "Don't smoke cigarettes!"