AN EXPLOSIVE row broke out at the Queen Vic as Zoe Slater’s huge lie was exposed in EastEnders.

Zoe returned to Albert Square earlier this year – after two decades away.

Since then, she has been hyper-focused on tracking down her long-lost son.

She told Sharon Watts that the boy’s biological father was Sharon’s late husband, Dennis Rickman.

In Friday’s episode, Zoe admitted to her mum Kat that this was a lie – and now the truth has come out.

Vicki Fowler shared with Kat that Sharon was determined to find the boy – even getting DNA from her granddaughter to speed up the search.

Not wanting to continue her daughter’s deception, Kat admitted the truth to Vicki – as a furious Zoe watched on.

Zoe lunged at Kat, pinned her against a wall and yelled: “Why would you do that? Always ruining it and sticking your nose in.

“You’ve just lost me my son.”

Vicki was absolutely furious, as she demanded: “Why the hell would you lie about something like that?”

Kat cut ties with Zoe, firmly ordering her daughter to stay out of her sight.

Viewers previously learned Zoe gave birth to twins, a boy and a girl, in 2006.

It was implied the girl tragically passed away, while Zoe abandoned the boy shortly after giving birth.

Flashbacks also revealed Zoe had a relationship with love rat Max Branning in their time away from the Square.

They met in a bar and soon hit it off before becoming serious.

Viewers watched Max assist Zoe in her quest to find the son she gave up for adoption – by hiring a private detective.

But in shocking scenes, the crooked PI attacked Zoe prompting her to hit him with a lamp and she fled.

In the process, she left Max behind when he didn’t immediately go on the run with her.

They briefly crossed paths again once both returned to Walford – only to part company.

EastEnders airs on BBC One and iPlayer.