Jessica Simpson Talks Second Pregnancy Surprise: 'Protection Was Thrown Out The Window!'

Jessica Simpson appears on 'The Tonight Show' on January 15, 2013 Jessica Simpson appears on 'The Tonight Show' on January 15, 2013

Jessica Simpson’s second pregnancy came less than six months on the heels of the birth of her first child – news that was a complete surprise to the new mom!

“I don’t know [how it happened],” Jessica told Ellen DeGeneres in an interview set to air Wednesday on “The Ellen DeGeneres Show.” “Apparently protection was just thrown out the window!”

Adding, “We were definitely extremely shocked.”

PHOTOS: Hollywood’s Hottest Moms & Their Little Ones

The “Fashion Star” judge, 32, said the second pregnancy has been the “complete opposite” of her relatively complication-free gestation with daughter Maxwell Drew.

“I felt amazing,” she said, recalling the ease of her first pregnancy. “Like, I could do everything, eat everything. Do whatever I wanted. I had a lot of energy.

“This time around… I’m like, exhausted, eating Tums. That’s my snack of choice!” she added.

PHOTOS: Stars Who Slimmed Down After Giving Birth

Jessica also said she’s much more weight conscious this time, after learning how hard it is to shed baby weight.

However, the fashion mogul said her fiancé, Eric Johnson, is supportive of her no matter how much she weighs.

“Apparently Eric still wanted me so… I can gain as much weight and I will have a husband-to-be that loves me!” she said.

As previously reported on AccessHollywood.com, news of Jessica’s second pregnancy broke in late November 2012, and the bubbly blonde confirmed the happy news on Christmas Day.

-- Erin O’Sullivan

Copyright 2014 by NBC Universal, Inc. All rights reserved.
This material may not be published, broadcast, rewritten or redistributed.