The actress, who plays Queen Vic landlady Linda Carter, has revealed that a police officer seen questioning Bobby Beale during the latest episode of the BBC soap, was played by her husband, Paul Stocker.
Paul played DS Howard South, as the fall-out from Bobby's attack on adoptive mum Jane began.
DS South was one of the police officers grilling the 12-year-old about his crimes, who was shocked when Bobby then confessed to killing his sister, Lucy, two-years ago.
Ahead of Paul's appearance, Kellie teased fans that her hubby would have a role in the episode.
She tweeted: "For all u @bbceastenders fans, keep a special eye out 4 my hubby in tonight's ep! I give you DS Howard South."
However, the real-life couple's characters are not set to come face-to-face on the show, with Kellie adding: "Sadly Linda & Howard never meet."
After the show, she wrote: "Thanku for all your lovely tweets about Paul. I must confess we haven't watched the ep in our house yet! I'm still reeling from Monday's..."
Earlier this month, the pair announced they were expecting their second child together.
She tweeted: “Shhh... Don’t tell anyone, but I’m pregnant. My hubby and I are over the moon and looking forward to meeting our little person in November #MamaAt40.”
Kellie also reassured fans she would be returning to 'EastEnders' after her maternity leave, adding: "And for those of you that want to know, I will be returning to @bbceastenders after I've had the baby #queenvicismyhome #LindaCarter4ever."