Taghrooda struck for the younger generation when beating a stellar field in the King George VI And Queen Elizabeth Stakes at Ascot.
The Investec Oaks winner maintained her unbeaten record as the filly swept past Telescope and Mukhadram to land the high-summer showpiece in convincing fashion.
Taghrooda (7-2), trained by John Gosden and ridden by Paul Hanagan, won by an impressive three lengths from 5-2 favourite
Telescope, with Mukhadram (12-1) just a short head away in third.
Hanagan said: "It's such a buzz, something you never think would happen.
"I'm just so delighted for the whole team - a great job."
Leitir Mor, the complete outsider of the eight-strong field, made the running until he was overtaken by the pack, headed by Telescope and Mukhadram, on the home turn.
Hardwicke Stakes winner Telescope and Coral-Eclipse scorer Mukhadram, wearing the Taghrooda colours of owner Sheikh Hamdan Al Maktoum, tried to steal a march, but they could not see off the attentions of the Classic heroine.
The daughter of Sea The Stars surged past the pair and put the race to bed within a matter of strides to vindicate her owner's decision to bypass last weekend's Irish Oaks.
Taghrooda is only the second filly after Pawneese in 1976 to complete the Epsom Oaks-King George double in the same season.
Hanagan said: "They went hard and I didn't plan to sit that far back, but you can only go as fast as you can and she adapted really well.
"If you take a look at her she's hardly had a race - she's so laid-back."