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Brittany Cartwright 's transformation journey just took a major turn ... cause TMZ has learned she recently went under the knife for a full-on mommy makeover.

"The Valley" star dropped the bombshell over the weekend, posting a post-op selfie showing her midsection wrapped in compression bandages with two visible surgical drains filled with red fluid attached.

"When they said 'remove what no longer serves you,' I took it literally," Brittany wrote on Instagram Saturday. "In all seriousness, y'all know I always keep it real and sooo...I did a thing. Something I've wanted to do for years and I finally took the step for me. I couldn’t be happier."

She added she's "still recovering," but already feeling "stronger (and lighter) every day," teasing fans that she'll share more soon.

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