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Megan Fox
turns 27 years old today!

The Tennesse native is definitely one of hottest actresses in Hollywood -- from her onscreen half-naked cameos to her scantily clad action scenes, the girl's proud of what she's working with!

And she should be -- did you see "This is 40"? Enough said.

As of September, the actress can add doting mom to her list of accomplishments -- Fox and her beau "Beverly Hills 90210's" Brian Austin Green welcomed their first child together, Noah Green, last year.

And Megan's already back in her pre-baby, bikini-ready shape (of course)!

We'll be seeing the brunette bombshell back on the big screen soon enough -- Fox is currently filming "Teenage Mutant Ninja Turtles," where she'll star as April O'Neil.

Click "Launch Gallery" above to see how Megan's changed over the years!