The birthday boy – who turned 11 – marked his special day on Sunday watching the Gunners beat Tottenham Hotspur 1-0.
Sharing in the football fun were his famous father David Beckham, and brothers Brooklyn, 14, and eight-year old Cruz. There was no sign of mum Victoria Beckham and two-year-old sister Harper – making the outing a boys' day out.
It was a final pre-back to school outing for the Beckham boys – who have just returned from LA.
Romeo was spotted capturing the sporting action on his smartphone. And a further memento came in the form of a picture with his side's mascot. David, 38, took a snap of his boy with green dinosaur the Gunnersaurus when the group bumped into the colourful character at the Emirates stadium.
Romeo passed up the chance to wear the red and white strip of his team on the fun day out, instead stepping out in a blue shirt and smart grey trousers. Finishing off the stylish look was a trilby and a chucky gold watch. Dad David meanwhile looked handsome as ever in a navy blue suit and tie.