The 'Confident' singer took to Instagram to share the news on Wednesday evening, posting a series of stunning snaps with the former The Young and the Restless star, including one of her massive diamond ring, alongside a lengthy caption.
"When I was a little girl, my birth dad always called me his 'little partner' - something that might’ve sounded strange without his southern cowboy like accent. To me it made perfect sense," Demi wrote. "And today that word makes perfect sense again but today I’m officially going to be someone else’s partner. I knew I loved you the moment I met you. It was something I can’t describe to anyone who hasn’t experienced it firsthand but luckily you did too."
She continued: "I’ve never felt so unconditionally loved by someone in my life (other than my parents) flaws and all... You never pressure me to be anything other than myself...
"And you make me want to be the best version of myself. I’m honored to accept your hand in marriage... I love you more than a caption could express but I’m ecstatic to start a family and life with you. I love you forever my baby. My partner. Here’s to our future!!!! Ps. THANK YOU... FOR HIDING BEHIND ROCKS AND CAPTURING THE ENTIRE THING!!! I love you boo!!!"
Demi, 27, and 29-year-old Max went public with their relationship back in March, and have been spending more time than ever together during the Covid-19 lockdown.