The doting father-of-two treated sons Bobby and Freddy to the excursion with Kate, just three days after tying the knot in Portugal.
Looking amazing, Kate wore a pair of skinny jeans and T-shirt, but it was her sparkler that stole the show.
Jeff took to his Instagram to post a family selfie in front of London's Cambridge Theatre ahead of watching Matilda the musical.
He captioned the sweet snap: "Brazier family trip to @matildathemusical for Freds birthday! All so excited!"
The doting father also shared a gushing post in honour of his son's 14th birthday.
He wrote: "My Freddy is a year older today! I couldn’t have wished for a more kind, caring and considerate son who makes us laugh all day every day.
"I wonder what I did to deserve him. He’s special, he’s loved and he is 14."
Jeff's new wife Katie also shared a sweet birthday post for his birthday saying: "Happy Birthday Freddy B.
"Five of your birthdays I’ve seen come and go and each year you make me more proud.
"Thank you for making me feel so loved, and for loving Mabel as much as I do. We love you."
The family venture comes after Kate and Jeff just got married in Portugal.
The couple tied the knot in a cliff-top wedding ceremony with Jeff's sons Bobby, 15, and Freddie, 14, as best men.
And Jeff is delighted with his new wife following their "really special" big day.
He told Hello! magazine: "I couldn’t be happier. This isn’t just any wedding, this is a really special one.
"We spend some lovely family time together as the four of us.
"I personally love it when Kate does things with the boys when I'm not around.
"I know the time Kate has with her family and friends is very precious to her and I know that Kate now realises boys are family.
"When she does take the kids with her, everybody always has a good time. That for me makes me feel like I'm marrying the right person."
It comes nine years after Jade Goody – the mother of Jeff's boys – died from cancer.
He has credited Kate for helping the boys deal with the grief of losing their mum, who died after a battle with cervical cancer in 2009 aged just 27.
He said: “What's going to be exciting to me is seeing the kids as older brothers, they'll be incredible. And it'll teach them about other responsibilities for them.
“It'll be fantastic for me too, I'll get to experience parenting within a relationship and actually be married, because I haven't experienced that – not even as a child.
“It'll be like putting things on track, being a real human being who is married and has a child with someone that he loves and stays with.
“Not that I didn't love Jade, but to be with someone where the relationship blossoms and goes from strength to strength… it's what we all try to create.”
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