elle fanning blake lively serena williams celebrity look of the week mermaid dresses

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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.

Are you into the look? Get (at least the makeup) for yourself: