Jenelle Evans' Ex Nathan Griffith Arrested for DWI in NC

Jenelle Evans' ex-BF, Nathan Griffith, now has legal problems of his own ... because he just got arrested for DWI.

The "Teen Mom 2" star was busted Thursday around 5:30 PM in Cary, North Carolina. Nathan was arrested outside a grocery store where he was handcuffed and taken into custody.

The 32-year-old, whose home address is listed in South Carolina, posted $10k bond and was later released. He's due in court next month.

As you know very well by now ... Nathan and Jenelle were in a nasty custody dispute this summer over their 5-year-old son, Kaiser. Nathan even got into it with Jenelle's hubby, David Eason, and it wasn't pretty.