"I love your strength, you grace, and your determination", he wrote.
In the post, the former first lady talked about the fond memories that they had shared over the years, naming her husband as her "bestfriend" and her "biggest fan".
Michelle responded in kind by thanking Obama via Instagram for sending "beautiful flowers" to mark the occasion. He also sent her a bouquet of gorgeous flowers and a handwritten card, in which you can see his well-known signature.
She thanked him, while captioning it 'You're my best friend, biggest fan, and getting notes and flowers from you will never get old'.
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Obama, who has infrequently used his Instagram account since his two presidential terms ended, posted a photo of the couple with the sweet caption, "You're not only my wife and the mother of my children, you're my best friend". The card was addressed to "Miche", a sweet nickname, and signed, "Happy birthday, B".
Michelle and Barack Obama arrive at the Obama Foundation Summit in Chicago on October 31, 2017.
"The idea that you would put up with me for a quarter of a century is a remarkable testament to what a saintly, wonderful, patient person you are", he said at the time. Michelle also took to social media then to wish her "best friend & most extraordinary man" a happy 25.
The pair, both Chicago natives, met in the late 1980's at a local law firm called Sidley & Austin.
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The final set took 2 hour, 22 minutes and Halep won on her first match point when Davis hit a forehand wide along the sideline. I think with that, she played extremely well. "Everybody who knows me knows I never give up, I always come back", she said.
While Ms Obama gained the number three spot, the former president was listed at number nine.
That wasn't Obama's only move to celebrate Michelle's birthday, though.
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On the 1989 tour, she was constantly donning the skater skirt and jazzing it up with an assortment of crop tops and sports coats. She attended her first Academy of Country Music Awards just five months before her first album was released, that was in 2006.