Billy Crudup and Naomi Watts attend the LuisaViaRoma for UNICEF Winter Gala at Emeraude on December 29, 2022 in St Barths. (Photo by Craig Barritt/Getty Images for LuisaViaRoma)

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Naomi Watts embraced the bohemian-chic aesthetic on Thursday evening for the UNICEF Winter Gala in St. Barths, sponsored by retailer LuisaViaRoma. Arriving arm-in-arm with her partner, The Morning Show actor Billy Crudup, the couple walked the red carpet for a good cause.

Watts adorned a royal purple backless gown with a plunging halter neckline and peplum from Roberto Cavalli’s Resort 2017 collection. The floor-length dress with colorful floral pattern was cinched at the waist with a tied fringe belt. The Watcher actress teamed her look with marigold-colored peep-toe sandals, gold chandelier earrings and a diamond tennis bracelet.

Crudup looked relaxed and refined in a black suit, sans tie, and a white button-down dress shirt with classic black leather loafers for the annual philanthropic event.

Billy Crudup and Naomi Watts attend the LuisaViaRoma for UNICEF Winter Gala at Emeraude on December 29, 2022 in St Barths. (Photo by Craig Barritt/Getty Images for LuisaViaRoma)

The Winter Gala is held every year to raise funds to support the various UNICEF projects across the globe. For this year’s entertainment, Lenny Kravitz and Drake both performed.

Watts and Crudup have been linked since 2017 but famously fly under the radar with their relationship. The pair met on the set of the Netflix original series Gypsy (they played husband and wife in the psychological thriller) and have managed to keep their romance under wraps.

The Australian actress shares two children with Ray Donovan actor Liev Schreiber: Sasha, 15, and Kai, 14.

The Almost Famous actor shares 18-year-old son William Atticus with his ex, Weeds actress Mary-Louise Parker.