‘Teen Mom’ Mackenzie McKee -- Please Invest ... In My Breasts!!!!

Mackenzie McKee wants to turn her mosquito bites into mountains…and, best of all, she wants you to pay for it.

The "Teen Mom 3" star has started a fundraising page on MyFreeImplants.com -- a kickstarter of sorts for boob jobs (who knew?).

According to her crowdfunding profile, McKee – a self-proclaimed fitness nut -- feels going under the knife will make her body “more proportionate” and help her take home gold at fitness and bikini competitions. She's looking to upgrade to a full C cup.

Also, it can't hurt that estranged husband Josh is out of the picture ... since he'd put the kibosh on her boosting her rack.

Mackenzie already has Bev Hills surgeon Dr. Neal Handel on standby -- but she still has a looooong way to go. As of now, she's only tallied up about $20 of her $5k goal.