Margot Robbie, whose estimated net worth recently reached $40 million, borrowed money from her mother, Sally Kessler, to help her out when she was starting out in Hollywood.

The key word here is "borrow," because Robbie always intended to pay the money back. Now the generous star has returned it and more, as she recently said in an interview.

"Everything I borrowed from my mother, I wrote down," the Barbie star told CBS Sunday Morning (via People).

"She would take money from things like house loans [to loan me money]. So I always thought, 'I have to pay it back.' And then one day, when I made enough money, I paid off that whole mortgage." [Mom, don't worry about the mortgage anymore. It doesn't exist anymore." [Anyone in my position would do that for their mother. Of course you would."

Robbie is probably right: since housing prices in Australia (where Kessler lives) average about US$606,000, she could afford to pay off her mother's mortgage without feeling a big hit.

But Robbie's generous nature shines elsewhere as well. Recently, "Barbie" co-star Ryan Gosling shared an episode that shows Robbie's heart is in the right place.

"Margot [on the Barbie set] had a pink day once a week and everyone had to wear something pink. If you didn't, it was a fine. She would go around collecting the fines and donating them to charity."

The Queen of Donations!