Hayden Panettiere Looks Radiant in First Appearance Since Entering Treatment for Postpartum Depression

Hayden showed her love for her fiance, heavyweight boxer Wladimir Klitschko.

Nashville star Hayden Panettiere was all smiles as she cheered on her fiancé, Ukrainian heavyweight boxer Wladimir Klitschko, during his match against Tyson Fury at the Esprit-Arena in Dusseldorf, Germany on Saturday.

Panettiere's appearance at the IBF IBO WBA WBO Heavyweight World Championship Contest was the first time she's been seen publicly since she began treatment for postpartum depression in October.

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WATCH: Hayden Panettiere Seeking Treatment for Postpartum Depression

The new mom appeared to be in high spirits while rooting for her fiancé in his title fight, and couldn't contain her excitement as she posed for photos in the crowd with a Ukrainian flag draped over her shoulders.

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Despite the enthusiasm, Klitschko ended up losing the title -- which he had held for over nine years -- to Tyson by a unanimous decision. The loss marked the 39-year-old Ukranian heavyweight's first defeat since 2004.

Panettiere and Klitschko welcomed their daughter, Kaya, in December 2014, and the 26-year-old actress began to open up about her struggle with postpartum depression when she sat down with ET in August.

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"What I thought postpartum was, was wanting to cause your child harm. You know, that really severe version of postpartum," the actress shared. "Now, having had a child, I've realized that it can be on quite a large spectrum, and the symptoms don't have to be as in your face and obvious."

"I definitely struggled with that a little bit," Panettiere continued. "I never felt any ill feelings towards my daughter, and never thought, 'I don't want to be a mom' or 'This is terrible' or anything negative. But, my personality all around was… I wasn't in a great mode… It's not a good feeling but women need to know that there are a lot of different kinds and that they're not alone."

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Juliette Barnes, Panettiere's character on her ABC drama Nashville, has also struggled with postpartum depression, as well as substance abuse issues. Panettiere has admitted in the past that her character's story line has helped her better understand her own struggle.

Here's more on Panettiere's decision to seek treatment for her depression.