Simon Cowell has vowed to 'edge into semi-retirement' as he aims to 'slow down'

Simon Cowell keeps comfortable in loungewear as he arrives to America's Got Talent

Inside pregnant Leona Lewis' life now as she turns 37 – from Simon Cowell split to disease

Heidi Klum and Sofia Vergara join co-judges Simon Cowell and Howie Mandel at AGT