EXCLUSIVE: Tiffani Thiessen on the 'Panic' Moment of Playing a Mom on TV

The actress also opened up about teaching her kids about giving back while volunteering with Feeding America.

Tiffani Thiessen is famous for playing teenagers on TV -- and now she's playing the mom of one!

ET's Katie Krause caught up with the Saved by the Bell alum at the Para Los Ninos Charter School in Los Angeles, where she served lunches to underprivileged kids through Feeding America -- and dished all about her new Netflix series.

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"[It does feel like a full circle moment] a little bit," Thiessen said of her upcoming Netflix series, Alexa & Katie. "It's a little bit of a panic moment for a second, but I'm actually really excited, and the girls are so darn cute!"

"The show, it has a very serious message, but it's a comedy," she revealed. "I play the mother of a teenage girl that's actually going through cancer."

"It is [a serious role], but at the same time, it's a coming-of-age story about these two young girls embarking on high school, and even though there's cancer to it, they really try to make it light," she explained. "Kind of the hard part of it is just being teenagers: they're worried about what they're going to wear to high school, and, you know, things that we all worried about... on top of her having cancer."

Thiessen, who shares 7-year-old daughter Harper and 1-year-old son Holt with husband Brady Smith, says Harper will definitely be tuning into her new show. The actress also brought Harper along while working with Feeding America, the nation's largest hunger relief organization, on Tuesday.

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"She was such an amazing little helper. She was giving out the food and then putting all the fruit and vegetables in the baskets," Thiessen shared. "We're here actually helping these kids get a meal [because during summer, they don't have that automatic lunch that they get when they're at school]."

"We talk a lot about being fortunate, and the fact that not everybody is in the same place, and [helping out] makes your heart feel good... Today, I wanted her to see that these kids are her age," she continued. "We feel very blessed, so it's nice to feel good about giving back a little bit."

The 43-year-old actress is also working with her husband on a children's book.

"It's [about] a subject that's pretty prominent now. I think this day and age, we're all very much into our phones and computers, and sometimes it's nice to just unplug... It's kind of just a reminder to sometimes put the phone down," she said, adding that she tries to remind her kids of that message every day.

"Absolutely! We have many unplug moments throughout the day, yes!" she confessed.