Do you know what the elegant, colorful hat-like object sitting upon women's heads at the Royal Wedding is called? Like many of us, you probably were unaware that the formal term is "fascinator." According to Dictionary.com, it is "a scarf of crochet work, lace, or the like, narrowing towards the ends, worn as a head-covering by women." They truly are fascinating, customized to match each wedding guests' outfits perfectly. From tennis star Serena Williams to singer/fashion designer Posh Spice and members of British royalty, check out some of our favorite looks below. They are all one-of-a-kind for a very special occasion.
1. Serena Williams
2. Amal Clooney
3. Sarah, Duchess of York
4. Anne, Princess Royal
5. Victoria Beckham
6. Lady Kitty Spencer
7. Pippa Middleton
8. Autumn Phillips
9. Zara Tindall
10. Sophie, Countess of Wessex
11. Abigail Spencer
12. Joss Stone
13. Carole Middleton
14. Sofia Wellesley
15. Karen Spencer
PHOTOS: Getty Images