Winx filly by stallion Pierro sells for record $10 million at Inglis ...

The first foal out of legendary race mare Winx has sold for a staggering $10 million at auction.

The 18-month-old filly, sired by Coolmore Stud's champion stallion Pierro, saw bidding begin at $2 million at the annual Inglis Easter Yearling Sale in Sydney.

She drew international interest but was sold to Winx's former part-owner Debbie Kepitis and her Woppitt Bloodstock.

The sale sets an all-time record for a thoroughbred yearling, doubling the $5 million paid for Black Caviar's half-brother in 2013 and dwarfing the previous filly yearling record of $2.6 million.

Ms Kepitis said she originally had not planned to buy back the filly. 

"We put her up for auction and then in the last few weeks, all of the family we started to miss our daughter, granddaughter," she said. 

"We just decided that as best we could, if we could get her we would."

She said the filly would be trained by Chris Waller, who trained Winx. 

"I am privileged to have been able to secure this filly on behalf of my family to be able to hopefully see if she can get to the racetrack," Ms Kepitis said. 

"If she can't get to the racetrack, she will be an amazing mum.

"She's Australian forever and she's going to be just fabulous."

Winx is among the greatest horses to race in Australia.(AAP: Steve Christo)

Winx stole the hearts of the nation as she claimed an Australasian record winning streak of 33 races, including 25 Group 1 wins and a record four Cox Plates.

She amassed more than $26 million in prize money before her retirement in 2019.

The mare delivered a stillborn foal in 2020 and was given a year off breeding before getting in foal to Pierro to produce this filly, born in 2022.

The ABC revealed on Friday that Winx is expecting her next foal by Arrowfield Stud's leading stallion Snitzel.