Tension between the two women boils over next week after Kat's estranged husband Alfie tells her that he wants a divorce, keen to concentrate on a bright new future with Roxy.
When a heartbroken Kat (Jessie Wallace) arrives at The Vic to pick Tommy up the next day, she tries to be civil for the sake of her young son. However, it's not long before she finds herself in an argument with Roxy (Rita Simons).
Kat is the first to resort to violence, slapping Roxy as she loses her temper. Roxy lets it go, but when a furious Kat does it a second time, a full-on fight ensues…
EastEnders airs these scenes on Tuesday, February 19 at 7.30pm on BBC One.
Digital Spy Soap Scoop video - watch Amie Parker-Williams reveal the biggest storylines coming up in EastEnders, Coronation Street, Emmerdale and Hollyoaks next week: