Yesterday, Amanda was photographed leaving the London Palladium, where the ITV show is filmed, following a busy day of auditions and birthday celebrations.
She showcased her trim figure in the tight pink jumpsuit as she made her way home from the theatre.
During the day, the TV and radio star enlisted the help of her co-stars Simon Cowell, Alesha Dixon and David Walliams to help celebrate her daughter Lexi’s 14th birthday.
She posted a short video on her Instagram account which showed the cast and audience singing to the birthday girl as she was presented with a beautiful cake.
Amanda told her 1.3 million followers: “Lexi is as old as @bgt – 14! So happy she had this wonderful moment with her friends and Us.”