She's currently shooting the new movie, Tully
Credit: Steve Granitz/WireImage

Charlize Theron usually wows on the red carpet in super-sparkly, super-plunging, body-hugging gowns but on Thursday night she attended the amfAR Inspiration Gala in L.A. in something very un-Charlize-like — a loose-fitting black ensemble.

She attended amfAR’s Inspiration Gala in Hollywood wearing a lace empire-waist Dior dress topped off with a long blazer. While she still looked as jaw-dropping as ever, her style switch-up is likely due to the star’s recent weight gain for her new role in the film, Tully.

Charlize Theron Filming 'Tully' In Vancouver

A source confirmed to PEOPLE that the actress gained 35 lbs. for the role of Marlo, a mom of three, and was recently spotted on set in Vancouver wearing a flannel shirt and baggy jeans.

According to E! News, even Chelsea Handler quipped about Theron’s weight gain at Thursday’s event, to which the actress candidly responded, “Yes, I am very fat right now.”

But last night wasn’t all about fashion, she was on-hand to receive the Inspiration Award for her work with the Charlize Theron Africa Outreach Project.

Theron recently gave the opening ceremony speech at the 2016 International AIDs Conference in July, where she said not enough is being done to fight the ongoing epidemic in Africa. She urged people that it’s “time to face the truth” and that there’s every tool available to fight the disease, but wondered why we haven’t overcome the epidemic yet. “Could it be because we don’t want to,” she asked.

And she brought up her call to action again during her acceptance speech at Thursday’s amfAR gala. “When I went home to speak at the opening of the International AIDS conference [in July], I stood in front of an audience of thousands and made a plea to end the deadly stigma and discrimination that puts the burden of AIDS on the world’s most vulnerable people,” Theron said. “I argued that we should focus on the ones that are hardest to reach, the poor, young people, women, girls, gay and transgender people—the people bearing the brunt of the epidemic.”

But Theron added that she forgot to mention something very important. “It wasn’t long after I gave this speech talking about how we couldn’t forget the most vulnerable among us that I realized I had forgotten someone. I had forgotten to mention sex workers, some of the most stigmatized people in the world and felt terrible. Despite our best intentions, sometimes people are still falling through the cracks and too many are not being seen.”

Her hope is to think creatively to stop poverty. “We need big bold ideas to fight poverty [and] end discrimination in hard to reach places.”

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