Selena Gomez Undergoes Kidney Transplant Due To Lupus

NEW YORK (CBSNewYork/AP) -- Selena Gomez is revealing why she's kept a low profile this summer.

The 25-year-old pop star said in an Instagram post that she received a kidney transplant due to her struggle with lupus and has been recovering from the procedure.

Her best friend, television actress Francia Raisa, was her donor.

The Instagram post includes a picture of Gomez and Raisa holding hands while lying side-by-side in hospital beds. Gomez also posted a picture of a scar on her abdomen.

"There aren't words to describe how I can possibly thank my beautiful friend Francia Raisa," Gomez wrote. "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, who revealed her lupus diagnosis in 2015, called the transplant "what I needed to do for my overall health.''

The post didn't reveal Gomez's current condition or say where or when the procedure took place.

Gomez's publicist declined to release more information.

(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)