Simpson and Johnson, a former NFL player, met and got engaged in 2010. The lovebirds welcomed daughter Maxwell, two years later, and son Ace, in 2013.
A year after giving birth to baby no. 2, Simpson married Johnson in a private summer ceremony at San Ysidro Ranch in Santa Barbara, Calif. And while they definitely appear to be very much in love, the duo doesn't plan on expanding their family anytime soon.
On Monday, Simpson appeared on The Ellen DeGeneres Show, where she swiftly shut down pregnancy rumors.
"I'm not pregnant," she confirmed adding, "We got an IUD, nothing's gonna get in that uterus."