Bone Thugs-N-Harmony Ken Bone Gives them Pregnant Pause

Bone Thugs N Harmony were amped at the prospect of getting a new member who's got the right last name for sure ... problem is, he's into something the group just can't handle.

We got the guys Friday night after they performed at Irvine Meadows Ampitheater ... and they knew all about debate star Ken Bone ... well, except for one thing, which is a deal breaker.