Millie Bobby Brown is showing off some new ink.

On Monday, the “Stranger Things” star shared a cute throwback clip from her 21st birthday celebrations enjoying a day in the sun at the Pearls of Long Bay private resort in Turks and Caicos.

In the Instagram Story video, the actress rocks a beige bikini covered in silver sequins while posing with a sandcastle-shaped bucket and white paper bag full of beach day essentials.

While her sequin-covered suit may have stolen the show, she also flashed a small tattoo on her upper thigh for the first time.

Though it appears to feature some text, the writing is too small to tell what the fresh ink says.

Brown accessorized her look with a pair of small brown sunglasses, gold hoop earrings and her platinum hair up and off her face.

She recently debuted another new tattoo in honor of her husband, Jake Bongiovi.

Earlier this month, Brown was spotted with the letters “JB” tattooed on her ankle while stepping out for a walk in London, with the body art visible above her footwear through her sheer black tights.

Her flashy platform loafers matched her head-to-toe leopard-printed look: a trench-style coat, adorable mini umbrella and matching pillbox hat, which sat atop her freshly dyed blond hair.

Tattoos aren’t a new trend for Brown, who married Bongiovi, 22, in May 2024.

She flashed a design featuring two delicate flowers on her back while attending the premiere of Netflix’s “Enola Holmes 2″ in 2022 as well as the name “Ruth” on her ribcage, which honored the memory of her late grandmother who passed away in 2020.

Additionally, the “Damsel” star has a petite heart tattooed on her collarbone, a cowboy hat on her bicep and celebrated her breakout role as Eleven in her Netflix series by inking the number “011” on her wrist. And in previous pics from a boat day on her trip, two small unidentified designs were visible on her hip.

For her milestone birthday, Brown celebrated in mermaid style, sporting a sequined dress with starfish detail as well as fishtail braids while she blew out candles on a beach-themed cake.