Gisele Bundchen and husband Tom Brady celebrate son Jack’s 13th birthday on Instagram

Tom Brady and wife Gisele Bundchen were overwhelmed with love on Saturday as they celebrated son John ‘Jack’ Edward’s 13th birthday.

‘HB2U HB2U HB2 Jack HB2u,’ wrote the 43-year-old football star, who posted a sweet snapshot of himself and his eldest son, whom he shares with ex Bridget Moynahan,  to Instagram.

In a post shared to her personal Instagram, Gisele marveled at Jack’s dedication to being the ‘best big brother’ to her and Tom’s two children, son Benjamin, 10, and daughter Vivian, seven.

Proud parents: Tom Brady and wife Gisele Bundchen were overwhelmed with love on Saturday as they celebrated son John ‘Jack’ Edward’s 13th birthday; Tom and Gisele pictured in 2019

‘Happy birthday Jack!!! I can’t believe you are already 13!!’ began the 40-year-old supermodel in her post’s caption.

‘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!!!’ 

In typical Gisele fashion, she included the thoughtful caption in her native Portuguese, as well.

Along with her text, Gisele posted two candid photos of Jack, which provided her 16.2million followers with a peek at their enviably tranquil family life. 

Twins: 'HB2U HB2U HB2 Jack HB2u,' wrote the 43-year-old football star, who posted a sweet snapshot of himself and his eldest son to Instagram

Twins: ‘HB2U HB2U HB2 Jack HB2u,’ wrote the 43-year-old football star, who posted a sweet snapshot of himself and his eldest son to Instagram

Eldest: Tom and Jack pictured in 2018 after New England Patriots training camp

Eldest: Tom and Jack pictured in 2018 after New England Patriots training camp

The first shot showed the now 13-year-old boy sitting on the bow of a boat with his arms wrapped around one of the family dogs.

The second photo showed Jack, Benjamin, and Vivian jumping off the ledge of a boat into the picturesque ocean water.

Each of the three children donned life vests and appeared to be holding hands as they jumped. 

In an Instagram Story post that she uploaded in February, Bundchen spoke candidly about being Jack’s ‘step mom’ and her aversion to the common designation.

Best big brother: In a post shared to her personal Instagram, Gisele marveled at Jack's dedication to being the 'best big brother' to her and Tom's two children, son Benjamin, 10, and daughter Vivian, seven

Best big brother: In a post shared to her personal Instagram, Gisele marveled at Jack’s dedication to being the ‘best big brother’ to her and Tom’s two children, son Benjamin, 10, and daughter Vivian, seven

Lucky: '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!!!' she wrote

Lucky: ‘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!!!’ she wrote

‘I don’t like the word “stepmom.” I like the word “bonus mom” because I feel like it’s a blessing in my life,’ she explained. 

‘I feel so lucky that I got to have an extra wonderful little angel in my life.’ 

In 2007, Bridget, who was 36 at the time, learned she was pregnant with Jack, after having split from Brady.

When Brady was made aware of the impending child, he had already entered into a full fledged relationship with Bundchen.  

In an interview with People last year, Moynahan opened up about the complicated period in her life, while also expressing joy over the fact that her and Brady ‘found partners that not only supported [them] in raising that child, but also loved [their] child as if he was their own.’

Meet the parents: Brady shares Jack with ex Bridget Moynahan, 49; Bridget and Tom pictured in 2006

Meet the parents: Brady shares Jack with ex Bridget Moynahan, 49; Bridget and Tom pictured in 2006

Earlier this month, Tom rang in his 43rd birthday surrounded by his blended family.

Gisele shared two images of Brady – one with her and their two kids together and another of in black-and-white of him alone – to her Instagram page on the football star’s big day.

‘Happy birthday love of my life!’ wrote the Brazilian beauty, who married Brady in 2009.

‘You are the best dad , the best partner and the best friend. We are so lucky to have you in our lives and we are looking forward to all the adventures ahead. We love you so much! ♥️♥️♥️’ 

Birthday boy: Earlier this month, Tom rang in his 43rd birthday surrounded by his blended family; Tom, Gisele, Vivian, and Benjamin pictured on Instagram on August 3

Birthday boy: Earlier this month, Tom rang in his 43rd birthday surrounded by his blended family; Tom, Gisele, Vivian, and Benjamin pictured on Instagram on August 3