Gallery Launch Gallery

It's officially time to party in the USA ... because Miley Cyrus is celebrating her 33rd birthday!

Miley's come a long way from her days as a Disney Channel star, developing into a legendary singer and songwriter ... and since she's shared plenty of hot shots along the way, it's time to share some of her best!

We can't stop looking at these photos, and we think you should go buy yourself flowers -- to celebrate Miley's big day, of course -- before you check out this gallery!

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