In honour of Mother's Day, Holly Willoughby posted a rare but stunning snap with her mum Linda and the duo look almost identical.The Dancing On Ice host, 43, donned a pretty light blue dress in the photo as she stood in front of her 74 year old mum. She wrote the loving caption: "You're not just my mum, you're my inspiration and guiding star.Thank you for your love and guidance... Happy Mother's Day mamma...