The two-year-old had won three times this year prior to setting off for France, most recently landing the Listed Marwell Stakes at Naas in July.
A run in the six-furlong Lowther Stakes at York showed that the filly did not appreciate a step up in trip to six furlongs, but a return to five supplied a Group prize on the continent for the Amo Racing-owned juvenile, who was partnered by Mickael Barzalona in Paris.
One of three British contenders, the chestnut broke swiftly and was eventually a straightforward winner in running prominently and quickening to cross the line a length and a quarter ahead of Vicious Harry.
“She did it very easily, Mickael wasn’t even hard on her,” said Haynes.
“I wouldn’t use the phrase ‘obliterated the field’, but she did leave them standing.
“We stepped her up, wrongly, to six furlongs and she didn’t see it out, it was great to see her show her speed again today. She deserved that.
“The instructions I gave to Mickael were just to make sure she jumped out of the gates, sit wherever she lands and she’ll try her heart out – that’s exactly what she did.”
Lady Hollywood’s triumph is not just a milestone for Haynes, but also for the stallion Havana Grey – sire of the filly and now off the mark with a Group-winning daughter.
Haynes said: “It’s great because it was Havana Grey’s first success and as a team it was our first Group success, too.
“You can’t fault her, she’ll likely have a break now and then she’ll head to the Breeders’ Cup.”