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Leave it to Fergie to make sure her insides are as clean and beautiful as her exterior!

The Black Eyed Peas singer visited a holistic health center in LA where colonics are performed.

Even though the visit is not so glamorous, Fergie Ferg still managed to keep her fashion in check ... rockin' a Motley Crue T-shirt, skinny denim, a killer hat and black heels paired with a fringed bag.

Hubby Josh Duhamel is a lucky man to have such a squeaky clean ladylove!