I never really dig headbands, despite Blair Waldorf single-handedly trying to bring them back. But Alexa Chung's knotted, navy headband instantly caught my eye. It looks EXACTLY like one that featured in Jennifer Behr's Summer '10 Collection and is likely to be as Lex has worn Jennifer's designs before. As have pretty much the entire A-list crowd of Hollywood. Trouble is, Jen's already onto her next collection now, but — don't you love it when it's a good but? — Fab tells me that she does custom orders so it's worth contacting her if you're willing to splash the cash. (Word up: the range sold in the US for between approx $66 and $320 so it's not cheap, but it is chic.) If you're on Thrifty Street, then check out the Topshop's Navy Jersey Plait Headband (approx $10) or Sportsgirl Nautical Knot Headband in Cream ($9.95). LOVE.