After hearing that Debbie was keen to move from South Shields to Dorset, the generous 21-year-old decided to step in and help.
"Perrie was going to get the mortgage for her and then Zayn offered to buy it outright," a source told the Sun.
Zayn Malik is said to have bought his fiancée Perrie Edwards' mum a house in Dorset
"She is just moving stuff in now. It costs more than £200,000 and is a new build. He's a really nice chap for buying the house. It's a lovely gesture ahead of their wedding."
Zayn is said to have a very good relationship with Little Mix star Perrie's loved ones, and certainly didn't buy the home just to keep up appearances. "He gets on really well with her family," the insider stressed.
Zayn and Perrie, 20, have been dating for two years after meeting when One Direction performed on The X Factor, which Little Mix went on to win. He proposed in August 2013.
The news comes days after Zayn and his One Direction bandmates were named the richest boy band in British music history.
Zayn Malik's band One Direction are reported to have a combined fortune of £70million
According to the Sunday Times Rich List, Zayn, Harry Styles, Louis Tomlinson, Niall Horan and Liam Payne each have an individual wealth of £15million, and a huge combined fortune of £70million.
In one year alone the band earned £45million, according to the list of the richest musicians aged 30 and under.
"There hasn't been another boyband who have made so much money so quickly," said the rich list's editor Ian Coxon. "Whether they will carry on at the same rate is anybody's guess."