Actress Naomi Watts, 54, flaunts her super fit figure in St. Barts

Naomi Watts showed off her fit figure as she hit the beach with partner Billy Crudup and friends in St Barts on Saturday.

The Australian actress, 54, appeared to be in the best shape of her life as she slipped into an orange triangle bikini and black trousers.

The Mulholland Drive star completed her look with a pair of stylish RayBan Wayfarers, multiple bracelets, a necklace, rings and studs.

Naomi Watts, 54, (pictured) flaunted her fit figure as she hit the beach with partner Billy Crudup and friends in St Barts on Saturday

Naomi and fellow actor Billy, 54, spent a lot of time grabbing their PDA between swim laps and playfully snuggling in the sand.

The lovebirds were joined by Naomi’s child Kai, 12, as well as her boyfriend, Australian Survivors host Jonathan LaPaglia, 53, his wife Ursula Brooks, 48, and daughter Tilly, 24.

Naomi and Billy were vacationing in St. Barts, where they were spotted arriving at the UNICEF Winter Gala on Thursday.

Naomi and fellow actor Billy, 54, (left) spent a lot of time grabbing the PDA between swim laps and playfully snuggling in the sand

Naomi appeared to be in the best shape of her life as she slipped into an orange triangle bikini and black pants

The annual philanthropic extravaganza is held to raise funds to support UNICEF projects around the world.

Naomi has been dating Billy since 2017 when they met on the set of the film Gypsy after splitting from Liev Schreiber the year before.

They regularly support each other at events, most recently at the launch party for their new brand, Stripes, and ELLE’s 29th Annual Women in Hollywood celebration, both in October.

The Mulholland Drive star completed her look with a pair of stylish RayBan Wayfarers, multiple bracelets, a necklace, rings and studs

Naomi beamed and threw up her hands as she walked towards the shore

The lovebirds were joined by Australian Survivors host Jonathan LaPaglia, 53, (far right), his wife Ursula Brooks, 48, (centre) and daughter Tilly, 24, (far right, behind Jonathan)

Naomi and Liev share two children, Sasha, 13, and Kai, 12.

Billy shares eighteen-year-old son William Atticus Parker with actress Mary-Louise Parker.

Liev, 55, has been dating model Taylor Neisen, 30, since splitting from Naomi.

The couple were holidaying in St Barts, where they were spotted arriving at the UNICEF winter gala on Thursday

Naomi has been dating Billy since 2017 when they met on the set of the film Gypsy after splitting from Liev Schreiber the year before

They regularly support each other at events, most recently at the launch party for their new brand, Stripes, and ELLE’s 29th Annual Women in Hollywood celebration, both in October