The former model posted snippets of home video of the couple tying at All Saints Church in Rickling, Essex on June 24, 2000.
She wrote: “20 years of marriage today !! 20 exciting, happy and fun years, married to my best friend. ”
The 45-year-old author who recently helped her TV chef husband film lockdown cooking shows, went on to explain that they had been forced to cancel their intention to renew their wedding vows this summer due to coronavirus.
The couple have been together for 27 years, Jools describing Jamie as his “first true love.”
She continued: “Yes, I’m driving you Bonkers and you probably deserve a medal etc … but being with you feels like home (and you know very much I like being at home) !!!
“I cherish the daily texts you send, you are funny and constantly positive, funny and a brilliant and devoted dad. ”
She also talked about their children, writing, “We created 5 wonderful children and lost our 5 little stars in the sky. ”
Last year, Jools talked about her past miscarriages during Baby Loss Awareness Week.
She has already shared her sympathies with parents who experienced a miscarriage, a dead birth or a neonatal death on International Midwifery Day.
Jools and Jamie have five children aged 15: Poppy, 18, Daisy, 17, Petal, 11, Buddy, nine, and River, three.
Jools also talked about wanting to have a sixth baby before the age of 47 next November.
Jools ended his message with a personal message to Jamie, writing, “Thank you for loving me the way you do. We did, in the next chapter. ”
She also joked about the video she shared, explaining that the couple had been “devastated” after losing their real wedding video during a move.
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The blurry footage shows an Elvis impersonator singing Can’t Help Falling In Love in the church aisle, before jumping to the couple sharing their first dance on the song I Only Want To Be With You.
She described the 1.5-minute streak as “paved” and joked that she had to work on her dance moves before renewing their vows.
She said it was “really the happiest day” that had “the best memories”.