"Thank you Mr.Arnault for believing in this little girl from the left side of an island, and for giving me the opportunity to grow with you at @LVMH," she wrote, naming multi billionaire Chief executive Bernard Arnault. "This is proof that nothing is impossible. Glory be to God."
The company said the new line is "fast approaching", and is due before Spring 2019 season ends.
Quoting a New York Times article, Riri confirmed she "will become the first woman to create an original brand at LVMH, the first woman of color at the top of an LVMH maison, and her line will be the first new house created by the group since Christian Lacroix in 1987."
As evidenced by the 32-year gap, the creation of a new line is an unusual move for LVMH, which normally expands via acquisition.
Formed that very year with the merger of fashion house Louis Vuitton with Moët Hennessy (the Champagne and cognac brands had merged in 1971), the company already controls many of the worlds high luxury brands, including Dior, Givenchy, Fendi, Marc Jacobs, Bulgari, Hublot, TAG Heuer, and Dom Pérignon.
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Rihanna's Fenty Beauty cosmetics line was already part of the company, as is the chain that sells it, Sephora. It made $562 million in sales for LVMH by the end of 2018.
The 31-year-old — real name Robyn Rihanna Fenty — has already had several successful forays into fashion, including collaborations with shoemaker Manolo Blahnik and sportswear company Puma, as well as her own lingerie range called Savage X Fenty.
Although he didn't disclose financial details of the deal, Arnault said Rihanna had been given "a unique opportunity to develop a fashion house in the luxury sector, with no artistic limits."
Arnault is the fourth richest man in the world, a mere $5billion shy of being worth $100billion.