Back in July, Sean -- who fell in love and proposed to Catherine on Season 17 of The Bachelor -- admitted to Us that Catherine's third pregnancy happened "sooner than planned."
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"The idea of raising three kids under three and a half years old, that's a little daunting if I'm being honest!" Sean said at the time.
"[Catherine]'s first thought was probably not excitement! Her first thought was probably, 'Wait, we're having a baby? I already have a baby! I'm not ready for another baby!' But after a few hours I think she got excited."
After getting engaged on The Bachelor's 2013 finale, Sean and Catherine wed in January 2014. They will celebrate their sixth wedding anniversary on January 26, 2020.
Sean and Catherine are the only couple in The Bachelor's 23-season history to tie the knot after getting engaged at the show's final Rose Ceremony.