Sian is the former anchor of Channel 5 News after being spotted by chiefs at the broadcaster in 2010Sian Welby, the showbiz reporter for This Morning, is co-hosting the show with Dermot O'Leary this week as ITV looks for a substitute for Holly Willoughby. Her debut on Monday garnered positive... Sian is the former anchor of Channel 5 News after being spotted by chiefs at the broadcaster in 2010Sian Welby, the showbiz reporter for This Morning, is co-hosting the show with Dermot O'Leary this week as ITV looks for a substitute for Holly Willoughby. Her debut on Monday garnered positive...