Jennifer Aniston's estranged mother has died aged 79.

The former 'Friends' actress is said to have visited her mother for the first time in five years on May 12.

A source told the gossip publication: "Jen must have had a wake-up call and wanted to see her mother one last time before she passes."

Nancy was rushed to hospital just after midnight on Sunday.

A source told Radar Online: "Her hands were curled up to her face and her skin was grey.

"She was wheeled out then very late at night at 1.30am. On Monday morning, all the lights were on in the apartment and the door was wide open."

Jennifer and her mother had a tricky relationship, and the star previously admitted her mum was "very critical" of her.

Nancy didn't help the situation when she published a tell-all book, 'From Mother and Daughter to Friends: A Memoir', about Jennifer's life in 2009.

Speaking last year about her mum, the 47-year-old star said: "She was critical. She was very critical of me.

"Because she was a model, she was gorgeous, stunning. I wasn't. I never was. I honestly still don't think of myself in that sort of light, which is fine.

“There are people in my life that are like, 'How do you even talk to that guy?' But what's the point of holding on to [anger]? That's so toxic."

Nancy married actor John Aniston in 1965 but they divorced when Jennifer was just nine years old.