Spears and Timberlake may not have had the most amicable breakup, but they definitely did make pop culture history with their matching denim outfits at the 2001 American Music Awards. While this makes for a great couple's costume, Spears's look is more than recognizable enough to pull off all on its own.
What to wear: A long denim skirt, a sparkly belt, and a sleeveless denim top. Add a denim handbag, a chunky sparkly necklace, and a denim-clad partner for the full effect.