Millie Bobby Brown rang in her 21st birthday … under the sea. To celebrate another year around the sun, the “Stranger Things” star transformed into a mermaid, rocking long blond fishtail ...

With a glamorous mermaid look, a fun-filled birthday bash, and a sea of well-wishes, Brown’s 21st birthday was truly one to ...

Mother and daughter also wore shimmering, pink sequined mermaid-fit skirts ... Gwyneth Paltrow Wishes Ex Chris Martin a Happy Birthday with Sweet Photos of Him with Their Daughter Apple and ...

Millie Bobby Brown was also seen sporting mermaid-inspired fishtail brands ... Among those who sent her birthday wishes were ...

Kho Gaye Hum Kahan star Kalke Koechlin's birthday wish for her daughter Sappho might ... Sharing the images, Kalki wrote, "Happy birthday my pirate mermaid monster." The Gully Boy star's comment ...

To celebrate the momentous occasion, Cardi B went all out for her daughter and threw a mermaid-themed birthday party, which saw the rapper and her daughter match in adorable outfits in photos ...

On Sunday, the mom of three, 31, shared a few photos from daughter Wyatt's mermaid-themed birthday party, which included vibrant decor such as teal, purple, pink and orange balloons. Kylie ...

The Kardashian-Jenners are not the only ones who can throw a massive kids' birthday party for the ages ... 4 and the family threw her a lavish mermaid-themed bash at their house.