Kat Slater is a fictional character from the BBC soap opera EastEnders, played by Jessie Wallace. She was also played by Kate Peck in a flashback in 2001 and Sumar-Elise Sandford in a flashback in 2018. From Wikipedia
The proposal, part of a wedding photoshoot for their limo business, hints at a possible new chapter for the couple's tumultuous two-decade romance.