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Katy Perry might be celebrating her 41st birthday ... but we're thinking she's going to be feeling like a "Teenage Dream" for the entire weekend!

And we figured we'd celebrate the pop star's special day by putting together a gallery of her most sizzling shots -- we think each one's hotter than a firework!

These photos of this California girl -- or is it Gurl? -- will have you feeling wide awake real fast! Check out our gallery for more!

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