"Sending love Demi. I've relapsed many times. The recovery community has always welcomed me back with infinite love and support. Always here for you. One day at a time," Macklemore said.
Baldwin posted several heart emojis.
Lovato, on Sunday, thanked her family and fans for their support.
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"What I've learned is that this illness is not something that disappears or fades with time. It is something I must continue to overcome and have not done yet," she said.
"To my fans, I am forever grateful for all of your love and support throughout this past week and beyond. Your positive thoughts and prayers have helped me navigate through this difficult time. I want to thank my family, my team, and the staff at Cedars-Sinai who have been by my side this entire time. Without them I wouldn't be here writing this letter to all of you," she continued.
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