Allison Williams' Golden Globes gown weighed 40 pounds.
The 'Girls' star - who donned a stunning red Armani Privé dress to the annual award ceremony held at the Beverly Hilton hotel in California on Sunday night (11.01.15) - confessed she felt exhausted after sporting the heavy duty garment and joked she was going to develop muscles after partying in the gown all night.
She told the New York Daily News newspaper's Page Six column at the HBO Globes after-party: "I'm not getting up all night.
"I'm going to be jacked after wearing this all night."
The 26-year-old actress was joined at the Golden Globes by her 'Girls' co-stars Zosia Mamet and Lena Dunham.
Zosia, 26, opted for a two-tone Andrew Gn creation with Brian Atwood heels, while Lena, 28, sported a red backless Zac Posen design.
The hit HBO series - which was nominated in the Best TV Series (Musical or Comedy) category - lost out on the award to 'Transparent', while Lena missed out on the gong for Best Actress in a TV Series (Musical or Comedy) to Gina Rodriguez for her role in 'Jane the Virgin'.
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