EastEnders star Jessie Wallace has stunned her fans as she revealed her birth name in a throwback snap shared to Instagram.The 51 year old actress, who is best known for playing the iconic character of Kat Slater on the BBC soap, shared a snap of an old clipping from The Guardian newspaper in 1985, which she reposted from a friend.The sepia-coloured snap saw Jessie beaming alongside three of her pals wearing coats, with the caption reading: "Grin and bear it," before listing the four girls' names. What stood out though, was the revelation that Jessie's real name is, in fact, 'Karen Wallis'.