She is the co-founder of swimwear company, NAIA Beach. And was her own best advertisement as she modelled one of her stunning swimsuits in a sun-soaked snap shared to her Instagram page. The host, 54, showcased her phenomenal figure in the navy and white zebra print one piece, which retails online for £160. Tess’s swimsuit, which featured gold detailing around the neckline, was teamed with…