She wrote: "YALL. @beyonce BEY YON SAY wished me a happy birthday B****! I don't know how to ACT.
"She is my inspiration to be a singer after seeing destiny's child perform in the 5th grade… I LOVE YOU BEY! Thank You! Let me go drink some damn water"
The reaction comes after Lizzo told her fans the best gift they could give her for her birthday was a compliment about themselves.
She told her followers: "It's my birthday, the best gift would be... say something nice about yourself in my comments and shake that a**"
Meanwhile, Lizzo has been staying at home amid the coronavirus pandemic, and has urged people to "spread love" amid the difficult times.
She said: "You cannot let this tear us apart. The social distancing is something we are doing for our health, but we have to come together closer as a people.
"Call a friend that you haven't spoken to in a while, call a family member. This is a very real pandemic. I know we watch TV and we see a lot of fear on television, but you can't let the fear spread faster than the virus. We have to let love spread. So that's what I've been practicing every single day."