Jennifer Lopez offers Jessica Simpson advice on what to expect as a new mom

Jessica Simpson has her hands full as a new mom. The singer, actress, and fashion designer welcomed her first child with fianc Eric Johnson, baby girl Maxwell Drew Johnson, on May 1 in Los Angeles.

Singers Yandel, Jennifer Lopez and Enrique Iglesias announce their Summer Tour at Boulevard3 on April 30, 2012 in Hollywood, California. Philip Vaughan or

"This has been the greatest experience of our lives!!" Simpson wrote on her website, where she announced the arrival of her daughter, who weighed in at 9 pounds, 13 ounces.

First-time motherhood could become overwhelming, but Jennifer Lopez, who is a mother to 4-year-old twins Max and Emme, offered her best advice on what to expect as a new mom.

Shes going to be so sleepy, the 42-year-old star of the upcoming film What to Expect When Youre Expecting told Entertainment Tonight. She needs to get rest. Hopefully her man is helping her out a lot and they can balance that.

Above anything else, though, Lopez says Jessica should just cherish the moment.

Its a magical time, she continued. When that baby is first born it takes over your whole life. Just enjoy it. Just enjoy every second of it. It goes so fast. [My kids] are this big now. Its like I had them yesterday.