The Queen, 46, and Mrs. Obama, 53, have shared warm relations, with both advocating for the education of girls around the world.
The Jordanian royal has also spoken at events for Mrs. Obama’s Let Girls Learn initiative.
Queen Rania wrote the message both in Arabic and in English to reach all of her 2.8 million followers.
‘Exceptional First Lady,’ she wrote. ‘Looking forward to the next chapter in your life and the inspiration you will bring to girls’ education. Watch out world – you haven’t seen the best of this woman yet!’
The thoughtful words were accompanied by a throwback photo of the two smiling for the camera.
In the hours since it has been posted, the picture has earned 30,000 likes as well as supportive comments from around the world in several languages.
‘Both of you are an inspiration to women everywhere!’ wrote one. Another added: ‘2 of the most amazing, strong powerful women that always inspire me.’
In September of 2016, Queen Rania spoke at a Let Girls Learn event hosted by the First Lady, where the photo the Queen posted today was taken.
In addition to performances by the casts of Wicket, Waitress, The Color Purple, and Beautiful: The Musical, remarks were delivered by Queen Rania and Malawi First Lady Dr. Gertrude Mutharika.
‘This is what Margaret Mead meant when she said: “Never doubt that a small group of thoughtful, committed citizens can change the world…”‘ she said in her speech.
‘And they don’t come more committed than Michelle Obama. Thank you for bringing us together, Michelle…and for helping to keep girls’ education in the global spotlight.’
Michelle celebrated her birthday on Wednesday, and was met with touching tributes from fans and celebrities — including Adele, Beyonce, and Eva Longoria — on Instagram.