On the list of good deeds that leave the recipient in your debt for the rest of their life, donating an organ is up there with pulling someone out of quicksand or letting them use your phone charger when you're under 50 percent.
So many fans were understandably shocked when Selena Gomez cut ties with Francia Raisa, the longtime friend who gave Gomez one of her kidneys.
Selena suffers from lupus and a number of other health issues.
She gushed that Raisa "saved [her] life" following the procedure, but shortly thereafter, the friends stopped speaking and unfollowed one another on social media.
Rumors about the cause of Selena and Francia's split circulated for months.
Some of them were absurd, such as the claim that Gomez and Raisa fought over Justin Bieber.
Others seemed to have more of a basis in reality -- particularly the claim that Francia was upset by the fact that Selena was still drinking despite her myriad health issues.
Whatever the case, it seems Selena and Francia have officially put their differences behind them.
On Thursday, Selena donned a costume to the premiere of Frozen 2 with her 5-year-old sister, Gracie.
Naturally, the singer documented the occasion for her Instagram followers:
“Hope I’m officially the best big sissy ever now," Gomez captioned the pic.
"She was LIVING her best life!! Frozen 2 was amazing!!!”
For obvious reasons, the pic attracted many enthusiastic comments, including one from Raisa:
“Omg! My heart right now,” Francia wrote.
Unintentionally, the Grown-ish actress overshadowed the original post with that subtle indication that she and Selena have buried the hatchet.
“Friends again, I'm gonna cry," wrote one fan.
Interestingly, the reconciliation comes on the heels of news that Selena has quit drinking at the advice of doctors and loved ones.
While neither party has said as much, several sources have confirmed that Gomez's boozing was at the heart of her feud with Raisa.
“[Raisa] cares about her and she loves her,” an insider told Radar Online.
“She told her that she was just really making some unhealthy choices, and that she was concerned for her.”
The source says that while Francia never judged Selena, she felt she could not stand idly by and watch her friend make making “unhealthy” choices that might endanger her life.
It's unlikely that either Francia or Selena will offer a public explanation, but the important thing is that they're friends once again.