The Santa Clarita Diet actress wrote a heartfelt message about how "her sister" Diaz has always been there for her.
"#beautyjunkieweek #sisters. getting out of your house with your girlfriend. And being a whole person, with your sister. Remember to spend a moment with the ones you love in your busy life. She has made me feel beyond beautiful. Always has. Always will. #thankgodforyourfriends. They rejuvenate and confirm everything," Barrymore wrote alongside the selfie.
The actresses have maintained a strong friendship throughout the years. When Barrymore split from her husband, Will Kopelman, Diaz opened up about supporting her pal during her difficult time.
"Everybody pulls the wagons around [for] our friends, whoever needs us at whatever point in time," Diaz told Andy Cohen on his Sirius XM show, Radio Andy. "Even if it's something that the public doesn’t know about. Internally were all going, 'OK, who needs us now?'"