Charlotte Flair has us WWE-eak in the knees! And can you blame us?! She is wrestling royalty, after all.

The SmackDown star turned the big 4-0 on Sunday ... and she's lookin' fine as ever!

To celebrate her big day, we've rounded up her steamiest snaps -- from bangin' bikinis to workout wear and more!

If you like what you see ... then you'll definitely want to check out our gallery of all her sexiest shots!