Get ready to feel old.
Friday marks the 20th anniversary of 7th Heaven's debut on the WB, and actress Beverley Mitchell is celebrating the milestone by sharing priceless throwback pics of her and her on-screen siblings when they shot the pilot episode together. Mitchell, 35, sweetly gushed about her co-stars -- Jessica Biel, Barry Watson, Mackenzie Rosman, and David Gallagher -- on her personal blog.
PICS: Favorite TV, Music and Movie Reunions
"It honestly is a little too much for me," Mitchell writes about the sentimental occasion. "It is pretty hard to explain what these people mean to me -- they were more than my coworkers, they were more than my friends, they truly became my family and no matter how much time passes or how long we go before seeing one another, one thing is certain, the bond that we share and the love that we have is always there."
Mitchell -- who is still close to 34-year-old Biel -- says the two got along immediately.
"We truly were the best of friends," she reflects. "I mean THANK GOD for this girl, we have truly gone through it all and I couldn’t have picked a better partner to have had this adventure with. We didn’t always see eye to eye and sometimes we may have wanted to kill each other, but no one has taught me more than this girl."
"She has loved me through the best and worst of times and has always been there when I needed her," she adds. "20 years ago I was given a sister and I couldn't have asked for a better one!"
Mitchell also admits she and Biel had a shared crush on 42-year-old Watson, before he quickly assumed the big brother role both on-screen and off.
"Barry was the greatest big bro you could ask for -- you could always go to him for anything [and] though his advice was not always serious, the one [thing] that you always knew was Barry had our backs," she shares. "He still does and I love him to death!"
As for the now all-grown-up Rosman -- who posed for Maxim in 2013 -- Mitchell says the 26-year-old actress is a bit of a "wild child."
"We truly watched her grow up!" Mitchell writes. "Mack is our wild child, she always keeps us guessing and loves to shock us. Thank you Mack for always keeping me on my toes!"
Mitchell also has nothing but respect for 31-year-old Gallagher, who she says she has a "special connection" with.
"David is one of the most thoughtful and caring people I know," she gushes. "A ridiculously talented actor but an even better human."
7th Heaven, which revolved around Reverend Eric Camden (Stephen Collins), his wife, Annie (Catherine Hicks), and their seven children, lasted 11 seasons before going off the air in 2007. Years later, the cast proved to still be a tight bunch. In February, Mitchell, Watson, Rosman, and Hicks reunited with Biel in Los Angeles at her kid-friendly restaurant, Au Fudge.
ET exclusively chatted with Mitchell last May, when she talked about her special relationship with Biel, whom she said she was the closest to "from the get-go." The Valentine's Day actress was even a bridesmaid at Mitchell's 2008 wedding.
"I would describe our friendship as a sisterhood for sure just because we've gone through the ups and downs," she said.
WATCH: EXCLUSIVE -- Beverley Mitchell on Justin Timberlake and Jessica Biel's Parenting Skills: 'They Are an Incredible Team'
… But could we be seeing Mitchell showing off her dancing skills soon?! ET talked to Fuller House star Jodie Sweetin at the premiere of Kubo and the Two Strings earlier this month, when she revealed she's been talking to the mother of two -- as well as Step by Step actress Christine Lakin -- about appearing on Dancing With the Stars. Mitchell is filming Hollywood Darlings with Sweetin and Lakin -- an unscripted docu-comedy series on Pop -- debuting in 2017.
"We'll see. They might. You never know," said Sweetin, who appeared on ABC's popular dance competition herself last season.
Watch the video below to see more stars we would like to see compete on season 23 of DWTS.