The model mom, 42, posted a sweet tribute on Instagram Thursday in celebration of son Benjamin Rein's 13th birthday. Alongside a series of photos of ... in the house ! Happy birthday my sweet ...

"I can't believe my baby boy is now a teenager," John wrote, alongside a montage of photos and videos ... on her own Instagram page. "Happy Birthday my sweetest Benjamin," she wrote alongside ...

Both Brady, 47, and Bündchen, 44, took to Instagram on Sunday, December 8, to wish their son Benjamin a happy ... Along with the photos she wrote: "Happy birthday to the sweetest and funniest ...