Jessica Simpson: "If I Have a Ten Pounder, Pray For Me!"

Jessica Simpson has officially started her countdown to baby.

"At this point, I'm really ready," she tells PEOPLE. "I'm not sleeping very well; she moves all the time. I had a great pregnancy, but I'm ready for it to be over!"

"It's so much baby and so much amniotic fluid, it's crazy," theFashion Star mentor, 31, continues. "If we have a 10 pounder, pray for me!"

On Sunday, Simpson got together 75 of her nearest and dearest to help her celebrate her daughter's impending arrival with a shower set up to look resemble the carnival from one of her favorite children's books at a soiree organized by celebrity event planner Mindy Weiss.

After guests chowed down on southern foods that paid homage to Simpson's Texas roots and her favorite desserts, including fried Oreos and Twinkies, Simpson opened her daughter's gifts – including designer bathing suits, frilly dresses and of course, plenty of shoes.

"It was perfect," says Simpson of her shower, adding that now her focus is on her baby. "Right now, I can't wait to just hold her in my arms."