Nick, Joe and Kevin Jonas' little brother allegedly got caught red-handed this week with some illegal green on him in Nashville.
Frankie Jonas -- the "Bonus Jonas Brother," who's 16 -- was cited for possession of marijuana Tuesday night according to our Nashville sources. We're told he got picked up outside of a convenience store.
Sources close to the fam tell us Frankie's a good kid who's always kept his nose clean. He's actually graduated high school already and is taking college courses. We're told he's extremely remorseful about the bust.
Boys will be boys ... even Jonas boys.
Fun fact: Nashville passed a city measure in September reducing penalties for possession of small amounts of marijuana. Good timing, Frankie.