EastEnders actor Jamie Borthwick proudly introduced his baby niece to his fans on Wednesday, sending his co-stars wild for the adorable post.The 28-year-old star, who plays grieving Jay Brown in the BBC soap, posted a gorgeous black-and-white photo to his socials, promising the newest member of the family lots of "laughs". "She don’t know how lucky she is I’m her uncle!," he joked.