She’s never been one to hold back when it comes to sharing personal details, and Jessica Simpson was an open book during her interview on “The Ellen DeGeneres Show.”

The “With You” songstress explained that she wasn’t expecting to get pregnant with her second child only seven months after giving birth to her baby girl Maxwell- “Apparently protection was just thrown out the window!”

Simpson continued, "We're happy . . . We were definitely extremely shocked. Maxwell was our focus and then I was puking and lying on the couch.”

And this time around, things are a little tougher for Jessica. “This pregnancy is the complete opposite. Like with Maxwell, I felt amazing. 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."