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Note to Kate Upton: It. Is. On.

With that blonde bombshell starring in a new sexy slideshow, one that highlights the very best Kate Upton GIFs of all-time, Kim Kardashian was given no choice but the respond.

Does Upton really think she has the best bikini body out there? Does she really think Kim will lay down without a seductive fight, simply because she now has a baby at home?

Please. Kim Kardashian bikini photos were blowing up the Web long before Upton could legally vote… for real.

So sit back, toggle through the following images and decide for yourself just who has the most bangin beach bod on the planet: