Alongside a snap of himself and his mother smiling happily, the 70-year-old broke the tragic news to his 768K followers.
"So sad to say that my mother passed away this morning," The Tiny Dancer singer shared.
He then recalled: "I only saw her last Monday and I am in shock." Before emotionally writing:"Travel safe Mum. Thank-you for everything. I will miss you so much. Love, Elton."
The iconic pop legend has always had a close relationship with his late mum as he was raised primarily by his mother and maternal grandmother.
The two did go through a rough patch, only recently reuniting after an 8-year feud.
Following their troubled times, John told Daily Mirror, "Out of respect for my mother’s privacy, I have always shied away from speaking publicly about our relationship. However, I can say that we are now back in touch and have been so since my mother’s 90th birthday."
Sending the star and his family so much love during this difficult time.