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Even Megan Fox had that awkward stage.

The now-sexy star -- who's currently expecting her first child with Brian Austin Green -- posted a few old school photos of herself this morning on Facebook, telling fans to "say hello to my 12 year old self."

"I encourage you to admire my citrus/copper colored highlights (thanks Sun-in!) my braces, and my ever present sunburn," she writes ... showing she clearly has a sense of humor about her past styling choices.

And while some things have changed, her eyebrow situation has defintiely stayed the same!

She'd have her first break a few years later, when at the age of 16 she played Mary Kate & Ashley Olsen's nemesis in the flick "Holiday In the Sun" -- check out her acting debut below:

See what more current Hollywood hotties looked like before they were famous in the gallery above!

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