As Rocky's big romantic gesture for Kathy leaves Sonia feeling fed up.
As Reiss plans a big party, Sonia gets crossed wires as she thinks it's for her birthday and is thrilled that someone is making her feel so special.
She soon tells Kathy that she's not been cared for like this for a long time, but when Reiss returns and starts talking about the party, the penny drops that he meant to celebrate King Charles, not Sonia's birthday.
Later on in the week, as Sonia gets increasingly fed up with Reiss' Coronation party talk, especially when Rocky makes a big romantic gesture for Kathy, Sonia confides in Rocky, who suggests she and Reiss need to get to know each other better.
Will Sonia finally tell Reiss that it's her birthday on Saturday?
When Rocky clues Reiss in about why Sonia's fed up with him, he goes overboard to celebrate her birthday.
EastEnders continues Mondays to Thursdays at 7.30pm on BBC One