The model has been friends with former X Factor contestant Rylan ever since he auditioned for her 2011 talent show Signed By Katie Price.
Katie and Rylan were both appearing on ITV's This Morning on Friday (25 October), which also marked Rylan's 25th birthday.
Rylan was stunned when old pal Katie surprised him at the end of his X Factor gossip slot with a yummy looking birthday cake decorated with a picture of the birthday boy himself!
After a round of 'Happy Birthday', mum-of-four Katie joked: "Do you think I'm going to stand here and hold [the cake]? Take it!"
Katie was joined at the TV shows by blonde-haired Princess, 6, whose dad is Katie's ex-husband, and mother and daughter posed for a picture with Rylan and his cake backstage. Hopefully he shared it around!
Rylan was clearly overwhelmed by all the birthday wishes he received today, tweeting afterwards: "Thank you so much for all your birthday wishes, and thank you to all sirens sending me gifts and cards. such a lucky boy Thank you so much x."
Katie, meanwhile, was on the show to promote her new autobiography Love, Lipstick and Lies, which references her affection for Rylan after he auditioned for her show and her pride in his success.
The author looked great in an on-trend cream fluffy jumper and orange pencil skirt.
During her chat on the sofa, she spoke about her joy at becoming a mother for the fourth time after giving birth to son Jett, her first child with third husband Kieran Hayler, in the summer. She's also mum to sons Harvey, 11, and Junior, 8.
"[The kids] absolutely love him," she said. "[Princess] jiggles him about; she tries to copy me. She wants to change his nappy or help me bathe him. Junior is always kissing him. Harvey has accepted him, I know because he draws pictures of him."