The supermodel's retiring from the Victoria's Secret Show runway after almost 20 years with the lingerie brand.
At the taping for the Victoria's Secret Fashion Show on Thursday, the singer sat front and center to cheer on his girlfriend as she walked in the popular fashion show for the third time.
The bra took over 930 hours to make and has more than 71 carats.
Hosk described feeling "a sensation that I've never felt before" the when she tried on the bra during a fitting to People's magazine.
In a separate post, she shared an excerpt of the song "This Is Me" in musical film "The Greatest Showman" and said: "This song from first segment of the fashion show always brings me to tears..." Also, for the first time, the Fantasy Bra will place sustainability centre stage.
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Adriana received a standing ovation when she made her final walk in "Flights of Fantasy" segment of the VSFS runway after 18 years of walking for the show. "And it was definitely a moment that I'll never forget".
Another standout VSFS rookie was Winnie Harlow, also known by her real name as Chantelle Brown-Young, the first model with vitiligo to walk the runway. For Victoria's Secret Fashion show novices, the Fantasy Bra is a bra that is covered in Swarovski created-diamonds and it's heavy, expensive and blinding.
But, the brand has continued to be criticised for failing to include women of different sizes in its annual show, which will air on December 2 in the US.
She also spilled on her pre-show diet and fitness regimen, admitting that she changes it up from year to year.