Now officially a teenager, Bobby marked the milestone with his This Morning star dad and younger brother Freddie, not to mention a few England footballers!
In honour of his big day, Bobby is at tonight's England friendly against Portugal, which is a warm-up for this year's Euro 2016.
But if just being there isn't enough, the birthday boy also had a very important job to do - flag bear!
Before the game kicked-off, Jeff and Bobby posed for a picture together as they waited excitedly under an official sign at Wembley Stadium.
Sharing the photo on Twitter, Jeff told his followers: "B'day boy is off to 'flag bear' whatever that entails & is hoping to meet @HKane #GetIN #Partner #ENGvPOR @vauxhall."
Earlier today, he also said: "Happy 13th Birthday to this not-so-little one. Flag bearer duties at the #ENGvPOR game as a birthday treat."
Bobby and his younger brother Freddy are the sons of Jeff's former partner, late-Big Brother star Jade Goody, who passed away in 2009 following a battle with cervical cancer.
Jeff has been bringing the boys up on his own since then - and is doing a fantastic job - but initially kept them out of the limelight. However, in recent times, Jeff has begun giving fans a glimpse at how much Bobby and Freddy have grown.
Proving just how football-mad his son is, last month Jeff shared a sweet picture of Bobby which was taken following his final game with his local Under 13s football club.
Happy birthday, Bobby!
Follow us on Twitter @RevealMag for all your celeb, fashion and beauty news!
Fancy winning some GREAT prizes? Check out Reveal Competitions here!