With five world titles to her credit, she becomes the most successful mogul skier in history ahead of Canadian Jennifer Heil and Norwegian Kari Traa, both gold four times.
Less than 24 hours after her coronation in singles, the 24-year-old Pyrenean found the physical resources necessary to chain four passages over the bumps of the Georgian station.
She easily dominated Finland's Riikka Voutilainen in the eighth, Britain's Makayla Gerken Schofield in the quarter and Austria's Avital Carroll in the semi-finals.
In the final, she found the American Jaelin Kauf, vice-world champion in singles on Saturday, and Olympic vice-champion in singles in Zhangjiakou (China) a year ago.
The two skiers had faced each other in February in Deer Valley (United States) in the World Cup and Laffont had taken the best.
She once again dominated Kauf, to clinch the gold.
The bronze medal went to Carroll, completing an identical podium to Saturday's single mogul event.
"Triple-double" for Kingsbury
"I can't believe it, doing the double at the World Championships is something you can dream of when you are an athlete and a skier on moguls. It's great!", commented Laffont after the final.
"It's hard to believe it, because it's so much work. A big thank you to my team, my partners, and everyone who works with me, without them I wouldn't have made it. C 'is crazy!', she added.
A year after her disappointing fourth place at the 2022 Olympic Games in Beijing, the 2018 Olympic mogul champion (single) returns to the top, after several months of doubt during which her Chinese failure could have pushed her to end her career.
After a start to the season on the podium, but still around first place, she picked up her first victory of the season at Deer Valley, in parallel, and it was the click.
She then chained another victory in the World Cup in Chiesa in Valmalenco (Italy), always in parallel and outclassed the competition on Saturday in Bakuriani in singles.
If Laffont is on his first double at the Worlds, the Canadian Mikaël Kingsbury signed him a "triple-double", since he doubled his gold medal on the single moguls on Saturday with a new title in parallel on Sunday, as he had already done so in 2019 and 2021.
He edged out Olympic moguls champion Walter Wallberg of Sweden, while bronze went to Australia's Matt Graham, for the same podium as Saturday's singles event, but in a different order.
Sixth the day before, the Frenchman Benjamin Cavet stopped in the quarter-finals on Sunday in doubles, beaten by Kingsbury.
© 2023 AFP