‘Buffy the Vampire Slayer’ Star Alyson Hannigan Displays 20-Pound Weight Loss In before & after Updates

Alyson Hannigan of "Buffy the Vampire Slayer" fame shows off her 20-pound weight loss in before and after photos in silver sequined dresses. She credited "Dancing with the Stars" for her transformation.

Alyson Hannigan once charmed fans on the hit series "Buffy the Vampire Slayer" and "How I Met Your Mother." Years later, she joined "Dancing with the Stars" and it transformed her life for the better.

She shared before and after photos of her figure in two side-by-side images, and the difference is remarkable. The pictures show her body visibly slimmer than before, and she said it's all thanks to the show.

"The before and after says it all. I lost 20 pounds of both weight and emotional baggage during my time on [Dancing with the Stars]," the actress shared. She thanked her dance partner, Sasha Farber, for his role in her journey.

She credited Farber for helping her "shed [her] insecurities, and getting [her] to the confident and strong place that [she is] today." In the same way that Hannigan is fascinated with her weight loss transformation, her friends and fans let her know that they also saw the difference.

"I just see confidence gained," Sarah Gellar commented. "You've always seemed a goddess to me," Seth Green complimented. "You look stunning in both, but this transformation is insane!" a fan added.

Hannigan joining "Dancing with the Stars" was a roller coaster ride. While it was difficult, it was also extra rewarding for her. To date, the actress calls it one of her "favorite jobs" that she has ever done in the industry.

With hours of dancing daily, Hannigan admits she threw healthy eating out the window because of the show. She focused on keeping herself full after burning hundreds of calories while dancing.

Hannigan's transformation revelation comes days after "Dancing with the Stars" judge Derek Hough revealed his wife was taken to the hospital. Hough asked fans for help storming the heavens with prayers for his beloved.