The starlet posted a cute picture of herself and Eric kissing to Instagram on Wednesday, 22 May, marking their big day.
"Happy four year anniversary baby," she wrote. "I am so honoured to be the mother of your babies and loved by you every moment."
She added: "I can't wait to marry you! Best four years of my life!"
Jessica and Eric met via mutual friends in May 2010, and announced their engagement that November.
Two wedding dates have been postponed because of the arrival of their kids Maxwell, born in 2013, and Ace, born the following year.
Joking last year, Jessica said: "We've had two different wedding dates, but he keeps knocking me up! We're doing it very backwards, I know... I don't know, I'll just keep my legs crossed, I guess, this time."
It's believed that their wedding will take place in the coming months, with Jessica recently teasing it will be an "extravagant" affair and claiming: "I don't do things small!"
Hopefully she shares some photos!
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Copyright: WENN Twitter @realbkbrown / Instagram @norman cook / E! Instagram @kimkardashian / Rex Features