The actress, 35, shared the happy news today alongside a picture of her baby girl.
Chelsee is already mum to daughter Coco, who is six years old. She and Coco’s father, Jack Malloy, split shortly after her birth.
The Hollyoaks star – famed for playing Goldie McQueen – confirmed she was expecting her second baby in July of this year.
Announcing news of the birth, Chelsee wrote on Instagram: “Cookie Al Rainford. 22.12.2023. 6lb.”
Speaking about her boyfriend – whose identity she has kept hidden – she explained to Closer Magazine: “This is the most supportive relationship I’ve ever been in.
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“My friends and family love him, and he’s the first bloke I’ve introduced Coco to, which says a lot.
“I knew he was The One within three to four months. I’ve kissed a few frogs, but he’s definitely marriage material.”
Just weeks before giving birth Chelsee teased fans by sharing a throwback with her man for the first time – but obscured his face.
She wrote alongside it: “Mummy and daddy.”
Chelsee previously admitted that her second pregnancy hasn’t been completely plane sailing and she ended up struggling at work.
She said: “I’ve struggled a bit this time round. With Coco I flew through pregnancy, but I’ve been experiencing all-day sickness and I’m exhausted.
“I’ve been sent home from work twice poorly and I’ve fallen asleep on set, I’ll be relieved when this part’s over!”
And she admitted her baby girl was a nice surprise for her and daughter Coco, who has been desperate for a sibling.
“The pregnancy wasn’t planned, it’s what I call a nice accident,” she told Closer.
“After I did a pregnancy test, I thought, ‘Oh my god’, and let out a nervous laugh! Initially I thought, ‘No, it’s not the right time’. Coco is the best thing that’s happened to me – although a bit crazy like her mum and doesn’t always do what she’s told!
“She’s so funny, she’s very independent and there are at least 10 arguments a day. So, I thought, while I’d love another child, I’d want to wait till she’s out of this phase till I think about another.”