Selena Gomez just announced on Instagram that she underwent a secret kidney transplant over the summer to help in her fight against Lupus. She posted the news on Instagram early Thursday morning as an explanation on why she had been inactive during the summer.

She received the gift of life from longtime friend and actress, 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,” Selena said in her post.