EastEnders fans shocked as they spot show icon working behind counter in East London cafe – and she yells catchphrase
Kat arrives in Walford as part of the Slater clan, She soon begins a fling with Steve Owen (Martin Kemp) behind the back of his girlfriend Mel Healey.
Kat's sister Zoe (played by Michelle Ryan) was revealed to be her sister after shocked viewers learned she was raped by her uncle Harry Slater as a child and Kat being only 13, was known as her sister.
Kat and Zoe's relationship was turbulent. They both vied for the attentions of Anthony Trueman. Kat and Anthony were together but broke up and Zoe then seduced him. Kat later learns she was pregnant but then has to have an abortion. She is comforted by her boss Alfie Moon but then he realises he is in love with her.
Kat, becomes briefly engaged to Andy Hunter a local crime boss (Michael Briggs) but she jilts him on her wedding day for the true love her life Alfie.
Kat sparks a romance with Alfie Moon and it is the love story of the square. She finally marries Alfie Moon on Christmas day in the Vic.
Alfie takes a loan from Andy which he is unable to repay and then threatens to kill him unless Kat sleeps with him. Their relationship becomes cold and distant.
One of Kat's biggest storylines was helping her daughter cover up the murder of Dirty Den Watts. She left the soap in 2005 sailing into the sunset with Alfie for a new life in America.
Kat returned to the soap in 2010 on the run from a man who she and Alfie conned for money. While Alfie was serving time, she had an affair with Michael Moon who happened to be Alfies cousin and she is now pregnant with his child.
Another Kat storyline focused on the breakdown of her and Alfie's marriage and her separation from Tommy and their twin sons Bert and Ernie.
Kat's union with Phil Mitchell began after months of feuding. She then sleeps with him marries him beginning a war with his ex Sharon Mitchell over the Mitchell empire.
The latest storyline has focused on her son Tommy who idolised Phil and is trying to get back at Kat for breaking up the marriage. Kat meanwhile is back with the love of her life Alfie who is suffering from cancer.