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Gisele Bündchen will forever cheer for her stepson.

The supermodel celebrated ex-husband Tom Brady's son Jack—who the former NFL star shares with Bridget Moynahan—in honor of his Sweet 16 on Aug. 22, sharing snapshots of the birthday boy throughout the years alongside a heartfelt tribute. One throwback photo showed Gisele carrying a then-baby Jack in her arms, while the teen is pictured standing back-to-back with the 43-year-old in an image taken in recent years.

"Happy birthday Jack!" Gisele captioned her Instagram post. "I can't believe that you are turning 16! I remember when you were just a little peanut and now you are towering over me."

She continued, "I am so lucky to have you in my life and I will always be here for you no matter what! Love you so much!"

Jack was also fêted by Tom—who shares son Benjamin, 13, and daughter Vivian, 10, with Gisele—in a separate post on the retired quarterback's Instagram page.

"16 years of joy with the the [sic] (sweetest, kindest, most loving etc etc) son, brother, friend and teammate any parent could ever hope for," the 46-year-old captioned photos of his oldest child. "You have changed our lives since the day you were born and everyday since has been such a blessing for everyone who knows you and is lucky to have you in their life." 

The seven-time Super Bowl winner also jokingly noted that the "next step" for Jack is learning to drive, quipping, "hahahaha … I'm gonna make sure I'm off the road."

Jack was born in 2007, eight months after his dad started dating Gisele. Though it was "a challenging situation" at first, according to Gisele, she and Bridget, 52, were able to weather the storm to eventually form a "great relationship."

"Everything in life comes with work," she told Vanity Fair earlier this year. "You have to go through the roller coaster. You have moments where you get to the sticky points and you've gotta overcome it." 

Describing Jack as her "bonus child," the Brazil native added that she feels "so blessed" to have a blended family.

"My world was them," Gisele shared. "I was taking them to school every day. I was making them breakfast, lunch… I was there." 

And though Gisele and Tom finalized their divorce in October after 13 years of marriage, the two continue to put on a united front for their kids.

"I'm trying to raise them—we all are, myself and their mom—in a very loving way toward one another," Tom explained to E! News in June, "to be very kind, to be empathetic and to have great perspective. Our kids are growing up in different ways than we grew up but also we want to raise them with the right values."

Keep reading for more family moments of Tom and his kids.

Gisele Bündchen shared this family photo on Instagram on Tom Brady's son Jack's 14th birthday, writing, "Happy birthday Jack! We are all so lucky to have you in our lives. Thank you for being the best big brother in the world. We love you soooo much!"

While wearing his Christopher Cloos x Brady sunglasses, Tom celebrates his Super Bowl win with daughter Vivian during the Tampa Bay Buccaneers boat parade. 

After winning his seventh Super Bowl, the Tampa Bay quarterback celebrated with his daughter Vivian.

Tom snuggled with his kids John "Jack" Moynahan (with ex Bridget Moynahan), Vivian and Benjamin in this adorable photo snapped by Gisele on Father's Day.

Brady went from quarterback to coach with his son on the beach, writing on Instagram that he's "#dadsfavoriteworkoutpartner."

Gisele shared this adorable photo on Instagram of Tom giving his son a kiss on the forehead.

The whole Brady-bünch posed together at the Mercedes-Benz in Atlanta ahead of the Super Bowl LIII, which the Patriots later won.

Tom lurked as Pennywise the Dancing Clown in a window behind his family as they celebrate Halloween in 2018.

As Tom geared up for another football season, he stopped to give his daughter a little love and clearly this one has her dad's full attention.

In July 2018, the Brady bunch headed out of town for a family vacation and they couldn't look any happier on their horseback riding adventure.

Tom celebrated Father's Day with a family dinner and lots of silly photos with his younger son, Ben. 

There's nothing sweeter than seeing the greatest quarterback of all time (he has seven Super Bowl rings) get smothered in love by his three kids.

Even though it was springtime, Tom bundled up with Ben for a fun day outside...complete with a little training.

Tom Brady as the Easter bunny? Who would've guessed?!

The super sweet family was all smiles during one of Brady's episodes of Tom vs. Time.

After playing in another Super Bowl, Tom took a little break with his family, complete with burger time and selfies.

Even though the Patriots lost the 2018 Super Bowl, Tom had his support squad ready and waiting to cheer him up.

Ahead of Super Bowl LII, the Patriots QB posed for pictures with his whole family including Gisele and oldest son Jack, second-born Ben, and daughter Vivian.

The New England Patriots quarterback showed his second oldest son a little love on his birthday in December of 2017, writing, "Happy Birthday to the sweetest 8 year old boy a mom and dad could ever ask for! So filled with love and joy! We are so proud of you Benny! And you shine a light that brightens our lives every day! We love you."

Vivian was the ultimate sous chef as her dad made her biscuits before Thanksgiving and really, what can't Brady do?

The dynamic duo of Tom and Ben spent a November day swinging in a hammock together and we really wish we had some R&R like this in our near future.

Leave it to Tom to teach his son more than just football. 

The Brady crew rolled around in the grass and enjoyed spending time together in June 2017 and it really does look like they are having a blast.

Who says you're too old to make funny faces?

When the Patriots headed back to Boston for their parade celebration after their 2017 Super Bowl win, Tom brought Ben along for the ride making him the coolest dad around.

Winning the Super Bowl in 2017 was great, but getting to celebrate with your daughter on the field is priceless. 

In 2017, Vivian gave her dad a big good luck kiss before he headed out for a game. Seriously, these two are so stinking cute.

Tom's fans span near and far, but his biggest fans are his three kids and their "Brady" jerseys continually make us love them even more as a unit.

Decorating the Christmas tree is twice as fun when you have your precious daughter helping you out...especially when she's dressed as a fairy!

The football player loves to spend his off time with his adorable kiddos at the beach and we totally approve.

Watch E! News weeknights Monday through Thursday at 11 p.m., only on E!.