In the movie “The Substance,” Demi Moore plays an entertainer in her 50s so intent on hanging onto stardom that she signs up to take a potion that will restore her youth, but at a horrific price.

“This is more joyous,” Ms. Moore said of the beautification process leading up to W Magazine’s Golden Globes party held on Saturday evening, the night before the ceremony, in a top floor suite of the Chateau Marmont hotel in West Hollywood.

She was decked out in a black and white polka-dot dress from Nina Ricci as she stood in a tented area where the smell of cigarette smoke was surprisingly strong and household-name celebrities and fellow Globe nominees were everywhere.

The party, co-hosted by W’s Magazine’s editor in chief Sara Moonves, and its editor at large, Lynn Hirschberg, was celebrating the magazine’s annual Best Performances issue, and the walls were covered with enlarged photographs of the featured celebrities.