Cher surprised a fan living with Alzheimer's with a FaceTime call.

The Believe singer shared a special moment with Erica Steiner's mother Robin - who has the dementia-inducing brain condition - chatting to her for almost eight minutes.

Alongside a TikTok clip of the sweet exchange, Erica wrote on Twitter: "My mom has Alzheimer's and is @cher's biggest fan.

"Well today Cher surprised her with a call. Best. Moment. Ever."

The video shows the moment her mother realises Cher is on the line.

Tearing up, she said: "I love you... I can't do this. It's too much."

Erica - who is in a relationship with FOX Sports WWE Analyst Ryan Satin - ​later revealed the 74-year-old pop superstar had a long chat with Robin, and she's already thinking of ways to "top" her big surprise.

She tweeted: "I'll definitely never be able top this ... but it makes me want to try. I think John Travolta's up next. I still can't believe this really happened I'm shaaaaaking... They had a whole ten minute conversation (sic)"

In October 2020, Erica arranged for actor Ryan O'Neal to FaceTime with Robin, after the 80-year-old actor learned via social media that she kisses his photo every night before going to sleep.

Ryan's 1970 movie Love Story is one of Robin's favourite movies and she kisses the DVD box with him on it each evening.

Erica began sharing her mother's journey with Alzheimer's on Twitter and TikTok, after becoming her full-time caregiver.