Cher surprises longtime fan with Alzheimer's with a FaceTime call

Cher treated her biggest fan to the sweetest surprise!

The 'Believe' singer, 74, shocked a woman who was diagnosed with early-onset Alzheimer's with a lengthy facetime call. Watch above.

Erica Steiner shared the 10-minute phone conversation with her mother, Robin Steiner, on her social channels. During the call, Robin wore a t-shirt with a giant picture of Cher.

On Twitter, Erica called her mother "Cher's biggest fan" and said the FaceTime conversation was the "Best.Moment.Ever."

READ MORE: David Letterman criticised for 'bullying' female celebrities after past interviews resurface

In the video, Cher revealed secrets behind her 1965 hit song 'I Got You Babe' that she performed with ex-husband Sonny Bono.

"Do you know what I told Sonny the first time I heard it? I said, 'This is crap,'" Cher told Robin of her famous track. "When he was singing it, it didn't sound the same as when we sang it together."

READ MORE: Cher apologises for George Floyd tweets that sparked backlash

Erica said her mother had been a major fan of Cher, and her music had served as therapy in her house. "You're medicine in this house," Erica said.

"Cher is basically another caregiver in our house — her presence consistently calms my mom when she's frustrated or sad."

Later in the video, Robin becomes overwhelmed with emotion, saying, "I love you... I can't do this. It's too much."

Watch the full video here.