Alyson Hannigan Shows 20-Pound Weight Loss In 'DWTS' Before & After Pics

• Alyson Hannigan took part in Dancing with the Stars this year, and posted a before-and-after shot showing her 20-pound weight loss at the end of the season.

• The actress explained that dance pro Sasha Farber helped her gain confidence and strength along the way.

• Alyson isn't the only celeb to lose weight on the show, which requires lots of hours of intense dance prep.

Alyson Hannigan competed on Dancing with the Stars this season alongside pro Sasha Farber, and even though the duo didn't win the trophy, Alyson gained a lot of perspective and reaped some health benefits along the way.

This week, the 49-year-old posted a before-and-after shot of herself on Instagram that showed the physical results of all her hard work. “The before and after says it all,” the How I Met Your Mother alum wrote in the caption. “I lost 20 pounds of both weight and emotional baggage during my time on @dancingwiththestars. I can’t thank @sashafarber1 enough for helping me shed my insecurities and getting me to the confident and strong place I am today!”

The "after" pics show a super-strong Alyson smiling at the camera in her final dance costume:

People cheered her on in the comments. “You’ve always seemed a goddess to me 🔥,” wrote Seth Green. “I just see confidence gained,” said Sarah Michelle Gellar. And then there was this hilarious reference someone made to her American Pie days: “This one time at dance camp...you absolutely smashed it!”

Sasha also shared the before and after shot on his own Instagram page, giving Alyson props. “I wanted to post this picture and celebrate how proud and hardworking my partner was during the season!!!!” he wrote. “I believe dance is the best way to exercise, stimulate the brain and have fun in the process. I call it ‘BodyBySasha.’ Who wants to sign up!!!!!”

Alyson also chimed in, writing “Take it from me, it WORKS!!!” in the comments.

Alyson isn’t the only star to lose weight while training for and competing on the hit dance show: Kaitlyn Bristowe, Lauren Alaina, Jennie Garth, and Melissa Gilbert have all talked about getting toned and lean while filming.

One thing is super clear. Alyson definitely put in a lot of hard work in to nail their routines. Just check out this super cardio-heavy salsa routine the two performed together. It's tiring to watch!

Plus, Alyson just seemed like she was having a great time while filming. She has had nothing but great things to say about her run on DWTS, including a tear-jerker post she shared that had a BTS video of herself and Sasha practicing hard, goofing off together, and generally having what looks like the best time ever.

“Where do I even begin? I really don’t have enough words in my vocabulary to express my gratitude for this experience. To go into this journey with mostly fear, and come out how I feel now is indescribable,” she said.

“I cannot thank @sashafarber1 enough for everything he gave me, shared with me and experienced with me,” Alyson continued. “I couldn’t have asked for a better partner. Thank you for not giving up on me. Thank you for giving me confidence and making me feel like I could do this and then getting me there and having so much fun along the way. I am so glad that you came into my life and you’re not gonna get rid of me now.”

Check out Alyson totally crushing this routine, by the way:

Congrats on an amazing season, Alyson! You crushed it!

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