Mike Coppola, Getty Images
The singer/reality TV star got candid about her surprise second pregnancy with Jay, admitting that it was a total surprise and that a strange feeling over a planned party in Venice spurred her to take a pregnancy test.
"We were going to go to Venice to have a fun party day with our friends and I had this overwhelming guilt. I'm like 'Why do I feel guilty about going to have cocktails with my friends? Maybe I should just pee on a stick.' Because we weren't trying, but we were ... practicing," she laughs.
The couple became engaged in 2010 but have since had their marriage plans interrupted by Simpson's multiple pregnancies.
"We've had two different wedding dates, but he keeps knocking me up," Simpson told Leno. "We're doing it very backwards, I know. I'll just keep my legs crossed I guess this time."
"I want him to be my husband so bad, and I do still want to wear the pretty gown and everything. I have to wait until after the baby. And now she'll just be in the wedding," Simpson said.
The former "Newlyweds" star also discussed her upcoming project for NBC, a show based loosely on her life for which she will play herself. Watch Jessica's full "Tonight Show" episode over at NBC.
- Beyonce Before, During and After Pregnancy
- Jennifer Lopez Before, During and After Pregnancy
- Hilary Duff Before, During and After Pregnancy
- Britney Spears Before, During and After Pregnancy
- Jessica Simpson Before, During and After Pregnancy
- Pink Before, During and After Pregnancy
- Jennifer Hudson Before, During and After Pregnancy
- Celebrity Makeup Makeovers
- Kelly Osbourne
- Christina Aguilera
- Nicki Minaj
- Taylor Momsen
- Lily Allen
- Musicians You Never Knew Were Adopted
- Faith Hill
- Eric Clapton
- Sarah McLachlan
- Debbie Harry
- Jamie Foxx
- Willie Nelson
- Darryl "DMC" McDaniels of Run-D.M.C.
- Rachel Crow
- Celebrity Photobombs
- Peek-a-Boo Sheryl Crow, We See You! (Even if Justin Bieber Didn't.)
- This Guy Is SO Not Impressed by Rihanna and Katy Perry.
- Kelly Osbourne and Neon Hitch's Photo-Op Is Crashed by an Over-Enthused Lurker.
- Demi Lovato's Little Sis Madison Perhaps Isn't the Biggest Britney Fan.
- Paul Stanley, Sir Elton John and Erin Sutton Get Creeped on.
- Katy Perry Is Unaware That Glen Campbell Is Having a Psychic Moment Behind Her.
- Diddy REALLY Wanted to Be in This Shot With Muhammad Ali and Will Smith.
- This Passerby Can't Resist Sharing the Spotlight With Rihanna.
- Kim Kardashian and Nicki Minaj Try to Box Out a Fellow BET Awards Attendee.
- Celebrities Who Married Young - Barely Legal Brides!
- LeAnn Rimes Was a Bride at 19
- Avril Lavigne Was 21 When She Walked Down the Aisle
- Hilary Duff Said 'I Do' at 22
- Kevin Jonas Proposed at 21, Married at 22
- For Hanson, Marrying Young Runs in the Family
- Kate Hudson Married at 21 After Dating Just a Year
- Solange Got Married in a Hurry