"Jen has reached a point where she couldn't manage the day-to-day business of living," Sky News quoted a friend as saying about Aniston's breakup with Brad Pitt. "That's when Courtney stepped in and took her under her wing."
The Los Angeles home Aniston is buying next to her best friend is worth an estimated $9.5 million.
In the past week, media reports have shown Pitt in a fatherly role with the adopted Cambodian son of actress Angelina Jolie.
Pitt, rumored to be romantically involved with Jolie, has made no secret of his desire to have a family.