A statement necklace can seriously amp up an outfit, as these stylish celebs prove. We love the ability to transform an outfit just by adding a great bib necklace, or a sparkling pendant necklace. Especially as Fall and Winter weather has us adding layers, jewels are the easiest way to add a pop of excitement, sophistication, or something on trend to add a little fashion to a cozy functional look. Check out our celeb accessory report, where necklaces, from Mandy Moore's playful Lela Rose piece to Monica Bellucci's decadent Cartier jewels, are the real star. Click on for the inspiration — then shop the looks.