Blake Lively used to idolise Britney Spears and based her prom outfit on the singer's style.The 'Gossip Girl' actress - who is married to heartthrob Ryan Reynolds - was fascinated by the pop star when a teenager and even based her school dance gown on what Britney's own style.Blake said: "[My teen idol was] Britney Spears. My prom dress looked like something she'd have worn - powder pink and with a bare midriff. I had to wear flat shoes with it, as my date was so short."While the stunning star is known for her stylish outfit choices, she has a favourite era for fashion and dreams of re-visiting the period and wearing the classic pieces.She told Tatler magazine: "I love old-Hollywood glamour and elegance. I feel like I'm displaced in time. I wish we could still go back to the grocery store in white gloves and a top hat."Blake treasures one piece of advice given to her by French footwear designer Christian Louboutin while they were on a shoot in France.She recalled: "Christian Louboutin once said to me, 'You make up your mind about what kind of life you want to live. I choose to live in a fairytale.'"We were on a Vespa in Paris on our way to a wedding - he was in a three-piece suit and my dress was trailing behind. It was beautiful."