'Ink Master' star Maddie la Belle: You Can Cuff Me ... After I'm Done Breastfeeding (MUG SHOT)

Former "Ink Master" contestant Madison Loftis, aka Maddie la Belle, found one more benefit to breastfeeding a baby when it bought her extra time before getting thrown in the slammer.

Law enforcement sources tell us Maddie turned herself into Greensboro, N.C. police Tuesday ... four days after a cop originally responded to a call of a domestic dispute she'd had with her boyfriend at their home.

What's interesting is the cop gave her a huge pass ... saying she could turn herself in once she had finished pumping enough breast milk for her 5-month-old daughter, Luna. She's been arrested for assault before so it's possible the cops knew she wasn't a flight risk.

When we reached out to Greensboro police, a rep told us the responding cop cleared it with his supervisor first, then filed a warrant so Maddie could stock up before going to jail. The kids stayed at home with their dad.

Maddie's currently behind bars with no bond.