LONDON, Jan 29 (Reuters) - Renee Zellweger shared that playing Bridget Jones feels like reconnecting with an "old friend" as she and the cast of "Bridget Jones: Mad About the Boy" gathered for the film's world premiere in London on Wednesday. Arriving over two decades after "Bridget Jones's Diary" first captivated audiences, this fourth installment in the beloved series shows Bridget navigating life as a single mother of two, following the passing of her