The actress shares son Caben-Albi with former Celebrity Big Brother co-star Jeremy McConnell and is currently in a relationship with Owen, who plays Romeo Quinn on the Channel 4 soap, with the pair confirming that they were dating in December.
"Thank you Owen for being the most amazing daddy, for loving me unconditionally, for being my best bud & for all the fun we have together and all you do for me," Stephanie wrote in a caption.
"My mummy once wished for me to have the most amazing daddy who would love me and care for me, and now I have one, the best one in the whole world. I'm so lucky to have you and everything you do for me ! Love Caben.
"Ps, mummy is the happiest mummy in the world."
Speaking recently, Stephanie also revealed her plans to marry Owen pretty soon, saying: "I can't imagine my life without him. He's so good to me, and he loves the bones of me. He's shown me what a real relationship is like.
"He's the one I am going to marry, so hopefully it'll happen next year. That's what he tells me."
Hollyoaks airs weekdays at 6.30pm on Channel 4, with first look episodes at 7pm on E4.
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