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It's Britney Spears ' birthday, and we're celebrating by taking a look back at some of her hottest moments throughout a career that's never lacked talent or drama.

Britney's 44 years old today, and she's been playing up the sex appeal for a few decades now ... so there's no shortage of hot shots for folks to enjoy. Trust us on this one. Gallery Launch Gallery Getty

The singer likes to basically bare all for social media these days, but there's nothing like taking a stroll down memory lane and looking back at Britney's glory days, when she was the biggest celebrity in the world.

Britney's still a huge star, don't get us wrong, but check out the gallery to see how she's changed over the years ... it feels like yesterday she was bursting ont

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