Elle Fanning, Blake Lively and Serena Williams Go For a Dip

We're feeling inspired to go swimming this weekend (or at least watch "The Little Mermaid," depending on how these thunderstorms go) due to the aquatic dresses celebrities donned this week. Thirteen-year-olds and tennis stars alike joined in on the mermaid look.

Elle Fanning wore a Marc Jacobs resort 2012 dress and Chanel platform slingbacks -- proving her impeccable red carpet style once again -- at the 2011 Women in Film Crystal + Lucy Awards. She went no-frills with a slicked-back ballerina bun.

Blake Lively shone in a Tibi Spring 2011 dress to promote her new film "The Green Lantern" on the "Today" Show. She put her blond-again hair half-up and wore the rest wavy for a laid-back look that perfectly complemented her structured frock.

Serena Williams donned a Burberry dress with Nicholas Kirkwood heels and pink lips (stars' new favorite trend?) at the WTA Pre-Wimbledon party in London. With her dark curls hanging loosely around her face and her metallic blue eyeliner, Williams could have easily passed for a glammed-up mermaid -- although we imagine those heels would be a little hard to swim in.[stylelist.com]