People.com Celebrity Watch Birthday Girl Jessica Simpson Perform - As a Kid! It's hard to believe those notes are coming out of a kid! By Kristen Caires Updated on December 1, 2020 11:15 PM Share Tweet Pin Email Pop-star and fashion-mogul, Jessica Simpson, turned 35 years old Friday. Long before her rise to fame, a pre-teen Simpson got her start performing in her church choir and recording her unreleased song “Somebody Believes In You” – with a classic nineties music video to match! – It’s undeniable that those pipes of hers have been around for quite a while. Nowadays, the mother of two has her hands full with adorable 3-year-old daughter Maxwell Drew and 2-year-old son Ace Knute with husband Eric Johnson, 35. Despite the demands of motherhood – the birthday girl is working on a new album!