Bedtime Story provided Aidan O'Brien and Ryan Moore with a treble on the day, as she made it four from four in the Group 2 Alpha Centauri Debutante Stakes.

A winner on debut at Leopardstown in June before following up in the Chesham at Royal Ascot, the regally-bred daughter of Frankel was last seen justifying 1/16 favouritism in the Silver Flash Stakes.

Returned the very same price this afternoon, the market leader was settled in third by Moore and was pushed along to close on the front pair with a furlong and a half to go.

Gradually getting to the front inside the final 100 yards, she extended her advantage close home and was half-a-length clear at the line.

Just as was the case in the Silver Flash, stable companion Exactly (17/2) finished second, while Barnavara was a neck away in third.

"We didn't want to go too fast today as it was a prep for the next day. She has a lot of speed early and Ryan was lovely on her as we didn't want to empty her out today," O'Brien, who earlier combined with Moore to win with Officer and Henri Matisse commented.

"She needed to get down and race a little bit late, but we couldn't be happier really.

"She'll go for the Moyglare now.

"Exactly wants a mile but she is improving."

Additional reporting by Alan Magee