Serena Williams attended an event for lingerie and sports bra brand Berlei on Thursday, the day after the world No 1 was announced as the top seed for the Australian Open. Williams, who is the face of Berlei, took centre-stage in a TV advertising campaign for the brand that aired for the first time on Monday, a week before the tournament kicks off. And Williams - who was pictured showing off one of the bras - joined models at the event in Melbourne, where the sportswear range was put to the test with a series of exercises. VIDEO Scroll down to watch Serena Williams stars in Berlei bra advert +13 Serena WIlliams shows off a colourful Berlei bra at an event in Melbourne on Thursday +13 +13 Williams takes the microphone on stage as she addresses the crowd at the event +13 The word No 1 fronted a TV advertising campaign for the underwear brand, which aired on Monday +13 Williams watches on as m...