Telling her 39.4 million followers, the "Someone Like You" hitmaker captioned the black and white picture with "Happy ten years old friend!"
"It's crazy how little I remember of what it was like and how I felt a decade ago," Adele added.
Universal Music Publishing Group also celebrated the momentous occasion, noting some of its achievements in the past 10 years.
In an "On this day" tweet, the entertainment giant said: Adele "graced the world with her iconic second studio album."
#OnThisDay ������ ���������� ������, @adele graced the world with her iconic second studio album ����.
The album is the best-selling album of the 21st century in the UK & was ranked the 'Greatest Billboard 200 Album of All Time' ��