Ryan Gosling's sister who stole the show with her low cut dress is a 40-year-old single music video producer

He walked the red carpet alone. But Ryan Gosling's sister Mandi, 40, filled in for his girlfriend Eva Mendes at the Academy Awards in Hollywood on Sunday.

Social media platform Twitter went wild over the identity of the 36-year-old's date as the ceremony aired on Sunday night. 

It's not the first time Gosling has been joined by his glamorous older sister, an LA producer who helped produce Pharrell Williams' Grammy award-winning song Happy.

Mandi, who Gosling once credited with helping him ‘think like a girl’, has appeared as her brother's date at numerous events over the past decade. 

Mandi, who appears to be single and has also worked as an associate producer on Dateline, has also accompanied Ryan to countless movie premieres and other celeb-packed events over the years. 

She was even at her brother's side for his first Oscar nomination ten years ago.