There’s no doubt about it: Anna Gunn looked radiant and gorgeous at the 2013 Emmy awards, where she scored the win for Best Supporting Actress on Sunday. But it wasn’t just her Romona Keveza dress with a curve-hugging black lace bodice and white floor-length gown.

Gunn sported a svelte new figure that looked very different than her character Skyler White on the award-winning AMC drama “Breaking Bad.” How did the 45-year-old actress shed the pounds?

According to Gunn herself, her weight gain while filming the show (after her character's pregnancy, of course) was a result of medication she was taking.

"I was actually ill while I was filming the show, and it affected my weight," Gunn told People magazine at the Governors Ball following the Emmys. "They gave me cortisone and I puffed up and gained weight. Now I'm better, thank God." 

Gunn did not discuss her health condition with People or elaborate on her weight loss. But according to Everyday Health, cortisone is a steroid to prevent inflammation of the body for conditions like “allergic disorders, skin conditions, ulcerative colitis, arthritis, lupus, psoriasis, or breathing disorders.” said cortisone can have side effects similar to what Gunn described, like swelling and rapid weight gain.

Gunn told People, though, that she is healthy now. "I'm doing fine, thankfully. I'm feeling really good,” she said.

The actress added that she stays in shape thanks to her daughters, 7-year-old Eila Rose and 12-year-old Emma Duncan, and a popular exercise regimen.

"I run around after two kids!" she said. "And I do Pilates."

Anna Gunn Anna Gunn at the 2013 Emmys. Photo: Reuters