Sunday was Sydney Sweeney’s 26th birthday, and she had a big party with an 80s prom theme.

The Euphoria star posted the first picture from her birthday party on Instagram. It showed big mirror balls and pink curtains hanging from the ceiling.

By reposting her friends’ Instagram stories, the star showed some of the more personal parts of her birthday night.

In the pictures, there was a lit-up dance floor, balloon towers, and a white banner with pink lettering that said “Syd’s Prom.”

Keeping with the theme, the birthday girl wore a cute minidress in bright pink with puffy arms.

The Reality star chose a look with big blonde hair and glowing makeup.

Ariana Greenblatt, who plays Barbie, shared a video of her daughter Sydney blowing out the candles on her beautiful three-layered cake while other guests sang a touching birthday song for her.

Nicola Peltz Beckham was also at the party, and she wrote a sweet birthday message to her friend Sydney.

“Happy birthday beauty! I love you so much,” she wrote.

Sydney became well-known after she did a great job in the HBO drama series Euphoria.