Claire Danes Had the Ultimate cinderella Moment in Light-Up Princess Dress 

Miss USA 2016 Viewers Outraged That Miss Hawaii Was Asked Who She’s Voting For

Father Defends Stanford Student Son Convicted of Sexual Assault, Calls Rape ’20 Minutes of Action’

Renee Zellweger: Why I Took a Six-Year Break From Hollywood

Miss USA 2016 Winner Deshauna Barber: Five Things to Know About Miss District of Columbia

Kylie Jenner\'s Twitter Hacked, Star Denies Existence of Sex Tape With Tyga

Yolanda Foster, 52, Showcases Her Incredible Bikini Body

Johnny Karagiorgis Dead: \'Real Housewives of New Jersey\' Guest Star Dies of a Heart Attack

2016 Miss USA Recap: Awkward Answers, Sexy Swimsuits and a Winner Is Crowned

Claire Danes arrives for the Costume Institute Benefit at the Metropolitan Museum of Art May 2, 2016, in New York. TIMOTHY A. CLARY/AFP/Getty Images

Cinderella moment on the Metropolitan Museum of Art’s Costume Institute Gala 2016’s pink, white and red carpet in NYC on Monday, May 2.

PHOTOS: Met Gala 2016 Red Carpet Fashion: What the Stars Wore

The Homeland actress, 37, turned heads in a pale blue princess gown by Zac Posen that actually lit up with fiber optics, perfectly embodying the theme of the night: Manus x Machina: Fashion in an Age of Technology. She finished with Eva Fehren jewels. 

PHOTOS: Met Gala 2016 Red Carpet Fashion: Best Dressed Stars

Claire Danes attends the Manus x Machina: Fashion In An Age Of Technology Costume Institute Gala at Metropolitan Museum of Art on May 2, 2016. Dimitrios Kambouris/Getty Images

PHOTOS: Met Gala 2016 Beauty Breakdown: Celeb Hair, Makeup Looks

While her hair was swept into a Grace Kelly-inspired chignon by celeb stylist Peter Butler, she made a statement with a cherry red lip. Celeb makeup artist Matin prepped her pout with ChapStick Total Hydration 100% Natural in Soothing Vanilla before applying the matte NARS Lana Audacious Lipstick.

Posen described the illuminated dress as “Celestial grandeur” in a teasing Instagram just hours before the Met Ball. “Guess who?” he continued.

Starry night! #Zacposen #metgala #glamour @metmuseum @voguemagazine @instagram

The designer later shared an even more revealing video of Danes and the dress, which featured intricate pleating and drape work as well as lit-from-within boning. “Starry night! #Zacposen #metgala #glamour @metmuseum @voguemagazine @instagram,” he wrote.

Tweet with @UsWeekly using the hashtag #stylebyUs!

Get celeb fashion, beauty tips, and more delivered directly to your inbox. Sign up for the Us Weekly Style & Beauty newsletter now!

Sign up for exclusive news about your favorite celebrities and more.