The mother-of-five slipped on some leather leggings, a white tee shirt and a smart military blazer to dine with her hubby at exclusive restaurant Novikov in London.
Katie, who was sporting long, wavy curls, held Kieran's hand as they made their way into the eatery on Tuesday (22 March).
Earlier in the day, she'd wished her partner a happy birthday via Twitter, writing: "Big happy birthday to my gorgeous husband."
The couple married in January 2013 in the Bahamas after a whirlwind relationship. Their first child together, son Jett, was born two years ago, while daughter Bunny is 18 months old.
While they looked blissfully happy last night, it's been a rocky road for the couple, whose marriage has played out in the headlines since the day it was announced they'd tied the knot.
Kieran was caught cheating on Katie with her best friend Jane Pountney in 2014, which led Katie to declare she'd be divorcing him. But she later did a U-Turn and took him back, but vowed she'd leave if he was ever unfaithful again.
"Other people think Kieran is a cheat and a liar but I don't care what they think. I'm the harshest judge and I know how much he has changed. In the past two years he's gone from boy to a man. I trust him 100 per cent," she told Fabulous magazine recently.
Big happy birthday to my gorgeous husband— Katie Price (@MissKatiePrice) March 22, 2016
Katie went on to say: "When he cheated on me, everyone told me to get rid of him. It would have been easy to do. But there was something in me that knew I shouldn't give up on him, and I've learnt a lesson about myself because I've never been good about second chances.
"Despite all the pain and horribleness that was going on when I found out he had cheated, I knew in my gut he was still the right man. And he's a better man for having gone through therapy and all that. I love him to bits and so do my kids."
Katie is also mum to son Junior, ten, and daughter Princess, eight, from her marriage to Peter Andre, and son Harvey, 13, from her relationship with Dwight Yorke.
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