Singer Selena Gomez has revealed she has undergone a kidney transplant and has thanked her friend who was her organ donor.
In a post on her Instagram account she explained she had been "laying low for part of the summer" and added: "I found out I needed to get a kidney transplant due to my Lupus and was recovering. It was what I needed to do for my overall health."
The actress and singer was diagnosed with autoimmune disease lupus in 2015.
On Thursday, the 25-year-old uploaded a photo of her lying in a hospital bed next to her kidney donor, close friend Francia Raisa.
Two additional pictures showed close-ups of scars on Gomez's lower stomach from the surgery.
She said that she and actress Raisa had both recovered from the surgery, and were very thankful for the care they received from medical experts during the process.
"Until then I want to publicly thank my family and incredible team of doctors for everything they have done for me prior to and post-surgery.
"And finally, there aren't words to describe how I can possibly thank my beautiful friend Francia Raisa. She gave me the ultimate gift and sacrifice by donating her kidney to me. I am incredibly blessed. I love you so much sis."
Gomez said that lupus "continues to be very misunderstood but progress is being made" and directed her fans to the Lupus Research Alliance website.
While Gomez did not give any details about when the operation took place, the Come & Get It hit-maker appeared at a high-profile party at New York Fashion Week on Saturday.
Raisa, 29, has appeared in TV series The Secret Life Of The American Teenager and Bring It On sequel All Or Nothing.