She wrote: "This little baby girl will make us a family of five".
Just previous year, the star even told Ellen DeGeneres that she was happy with her two kids and certainly not trying to have a third child. "Nothing's gonna get in that uterus!"
"I have two lovely children. We had an IUD", Simpson insisted, referring to a birth control implant.
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Last May, the former Fashion Star mentor made a now-infamous appearance on The Ellen DeGeneres Show where she swore she wasn't having any more kids. "But it would definitely have to be a miracle".
Just this April, Simpson joked with ET that she and Johnson "always practice" making babies, and admitted that she was having a little baby fever now that their kids are older.
"He's always throwing around the kids, and he's just an awesome father, it makes me want to stay young", Simpson shared. "And my husband and kids got to see me perform for the first time!"
The star has, in fact, stated in the past that she was not interested in adding any more kids to the family. "They're too cute ... you can't top that".