Bournemouth suffered a setback in their push for promotion as Kal Naismith's added-time goal gave Luton victory in a dramatic finish at Kenilworth Road.
Scott Parker's side, one point clear at the top of the Championship at kick-off, fell behind to an own goal by Lloyd Kelly, the ball ricocheting in off his shin after Mark Travers saved with his feet from Elijah Adebayo.
Luton doubled their lead when midfielder Allan Campbell beat Travers from 20 yards for his first goal for the club, but Bournemouth asserted themselves after the break and Emiliano Marcondes headed home Jack Stacey's cross.