The 27-year-old 'Locked Out Of Heaven' hitmaker's 55-year-old mother Bernadette Hernandez passed away at the Queens Medical Center in Honolulu on Saturday after being rushed there in a critical condition, reported TMZ online.
Bernadette, who immigrated from the Philippines to work as a hula dancer, was originally reported to have had a massive heart attack but sources said that she died from a brain aneurysm.
Grammy-winner Mars has been very open about his love for his mother in the past and even wrote a song called 'I Love You Mom' about her, in which he refers to her as a 'superstar' and 'my favourite girl'.
Family friend Anita Sojot previously said that the family were gathering to be at Bernadette's bedside, suggesting that her condition was serious.
"Bernadette is in hospital and the grandkids are all here, I'm looking after them. The family is on its way here right now and we are going to discuss what to do next," she said.
Mars, who is set to kick off his Moonshine Jungle world tour in Washington DC on June 22, is yet to comment.