Along with a throwback picture from her childhood, the 'Umbrella' singer wrote an emotional message on social media.
"10958 days ago @monica_fenty became a mother for the first time to her only daughter! Today is just as much your birthday as it is mine! I love you mom!," RiRi wrote.
"Thank you for carrying me, birthing me, raising me, supporting me, teaching me, and loving me unconditionally! The woman I am today is because of everything that you are! I thank God for perfectly hand picking you to be my mother when He sent my spirit to you! You are the greatest! Thank you!" she added.
A string of the pop icon's friends, including Ellen DeGeneres, Ryan Seacrest, Bruno Mars, DJ Khaled, sent her warm birthday wishes.