The biggest and sexiest runway took place at Lexington Avenue Armory in New York City Tuesday night -- the 2015 Victoria’s Secret Fashion Show. It was a star-studded event featuring Angels Alessandra Ambrosio, Adriana Lima, Behati Prinsloo and Candice Swanepoel, along with newcomers Kendall Jenner and Gigi Hadid. But all eyes were on Lily Aldridge. The 29-year-old model, who is married to “Kings of Leon” frontman Caleb Followill, wore the $2 million Fireworks Fantasy Bra.

Designed by luxury jeweler Mouawad, the Fireworks Fantasy Bra consists of 6,808 gems, diamonds, blue topaz, yellow sapphires and pink quartz. As if that’s not impressive enough, the pieces are set in 18-karat gold. Overall, the bra has 685 hours of labor invested in it.

But Mouawad didn’t do all the work. Aldridge also had to dedicate some of her time into creating the work of art. What some might not realize is that they took a cast of the model to build the bra around her.

This is Aldridge’s first time wearing the Fantasy Bra. She found out that she would be wearing the bra in July and couldn’t even tell her husband. Instead she had to keep her big news a secret from the 33-year-old rocker until the announcement was made public.

“He was so proud,” she told People magazine of Followill. “He was so excited. He sent me flowers.”

You can watch the Victoria’s Secret Fashion Show when it airs on CBS Tuesday, Dec. 8 at 10 p.m. EST.

Fireworks Fantasy Bra Lily Aldridge poses with the Fantasy Fireworks Bra by Mouawad backstage at the Victoria's Secret Fashion Show at the Lexington Avenue Armory in New York City on Nov. 10, 2015. Photo: Getty Lily Aldridge The Weeknd Lily Aldridge walks the runway in the Fireworks Fantasy Bra by Mouawad while The Weeknd performs at the Victoria's Secret Fashion Show at the Lexington Avenue Armory in New York City on Nov. 10, 2015. Photo: Getty Lily Aldridge VS Fantasy Bra Lily Alridge walks the Victoria's Secret Fashion Show runway at Lexington Avenue Armory in New York City on Nov. 10, 2015. Photo: Getty Fireworks Fantasy Bra by Mouawad Lily Aldridge's Fireworks Fantasy Bra by Mouawad is worth $2 million dollars. Photo: Getty