Light Shift gave Henry Cecil a famous eighth Oaks win after holding off the challenge of Peeping Fawn in the closing stages at Epsom.
Ted Durcan salutes the Epsom crowd after his win on Light Shift
Ridden by Ted Durcan, the 13-2 shot made a decisive move to the top of the field with three furlongs to go.
The Cheshire Oaks winner first shrugged off the challenge of leader All My Loving, ridden by Christophe Soumillon.
Although Peeping Fawn put in a strong run, Light Shift found another gear late on to take the win.
It was an emotional victory for former champion trainer Cecil, who also trained the pre-race favourite Passage of Time, who finished down the field.
Since his last Classic success, Love Divine in the 2000 Oaks, he has found success difficult to come by but he has been in resurgent form this season and Light Shift's win was greeted by loud cheers from the Epsom crowd.
He told BBC Sport: "That reception was fantastic. I thought they would go very close. I don't know what happened to the other filly [Passage Of Time] yet. I thought there wouldn't be much between them.
"It's lovely for Ted. He's a marvellous jockey and a great friend. It's also marvellous for the staff. They have been a great support to me.
"This means a lot. I'd like to say thank you to everybody. It's lovely to be back again. The reception is quite embarrassing really. Thank you all so much."
The runners were taken through the early stages by Sues Surprise and Kayah, with Richard Hughes sitting pretty just behind the leaders on Passage Of Time.
However, coming round Tattenham Corner Hughes slightly lost his position on his charge as Mick Kinane moved the gambled-on All My Loving to the front.
But Durcan was alert and Light Shift soon shot three lengths clear for a famous victory.
Durcan added: "It's unbelievable. She's brave and she stays with you.
"I looked to switch in and I just angled out behind the Aga Khan's horse (Four Sins). Once I lit her up she picked up better than I expected and I probably went a bit early on her.
"I was hoping for something to lead me to the furlong and a half marker, but the one near me was stopping so I tried to hug the rail and squeeze her along.
"Once the second horse (Peeping Fawn) arrived she picked up again up the hill.
"She's improved. Henry's a master and it's an honour to win it for him."
1. Light Shift (T E Durcan) 13-2
2. Peeping Fawn (Martin Dwyer) 20-1
3. All My Loving (C Soumillon) 5-1