"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'.
6 dead as huge storms batter Europe
A woman driver was reportedly killed after a tree fell on to her auto while she was travelling in Belgium's Grez-Doiceau area. The storm , called Friederike in Germany , is due to cross the country from west to east before reaching Poland overnight.
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.
Government announces next nine Smart Cities
Interestingly, as per RTI's reply, the Ministry has stated that total Rs 9,900 crore has been given to the States under SCM. As on 17 January 2018, there are 2,948 projects worth Rs 1,38,730 crore in various stages of implementation.
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.
Iran deal to 'fall apart' if Trump pulls out: Lavorv
If the deal does not come through, it would spill over into how the North Korean threat is handled, Lavrov warned. But he warned that the USA would pull out in a few months unless "terrible flaws" in the deal are fixed.