Married to one of Hollywood's finest-looking actors, Ryan Reynolds and having just given birth to her daughter, Blake Lively is one to look out for—be it for her upcoming movies, artisanal lifestyle venture Preserve, or coveted style and beauty looks. As a celebratory gesture for her 27th birthday today, we take a look at five of her best hairstyles, from a sleek oversized bun tucked behind her ears and a high braided ponytail, to Old Hollywood retro waves and her regular beachy, blown-out tresses.