We didn't realize how grave her situation really was.

Selena Gomez opened up about her recent kidney transplant during a sit-down on the Today show, and her donor/bestie Francia Raisa revealed why she wanted to undergo the risky surgery to help her friend.

"My kidneys were just done. That was it, and I didn’t want to ask a single person in my life. The thought of asking someone to do that was really difficult for me. She volunteered and did it. And let alone someone wanting to volunteer, it is incredibly difficult to find a match. The fact that she was a match, I mean that’s unbelievable. That’s not real," the singer told host Savannah Guthrie.

Raisa admitted it was a no-brainer to get tested to see if she was a match, after months of watching Gomez struggle with her health.

"One day she came home and she was emotional. I hadn’t asked anything. I knew she hadn’t been feeling well. She couldn’t open a water bottle one day. She chucked it and she started crying. And I said, ‘What’s wrong?’ and that’s when she told me. And she goes, ‘I don’t know what to do. The list is seven to ten years long.' It just vomited out of me: I was like, ‘Of course I’ll get tested,'" she explained.

The surgery had its complications, as the chart topper's new organ twisted around inside her body shortly after transplantation.

"My teeth were like grinding, I was freaking out. It was a six hour surgery that they had to do on me, and the normal kidney process is actually two hours. Apparently one of the arteries had flipped. I’m very grateful that there are people who know what to do in that situation," Gomez detailed.

We're glad she's finally on the mend!