Kilmarnock ended Celtic's unbeaten run in the league with a last gasp Matt Kennedy winner at Rugby Park.
The result means Brendan Rodgers' side still stay top of the Scottish Premier League, with the gap to rivals Rangers currently sitting at five points, but Kilmarnock move to fifth.
Matt O'Riley opened the scoring after Callum McGregor showed some excellent footwork to force a save out of Will Dennis in the Kilmarnock net.
O'Riley was there to pounce on the lose ball and grab his ninth league goal of the season so far.
Kilmarnock pushed Celtic hard in the second half and were rewarded for their work when former Liverpool defender Nat Phillips turned the ball into his own net.
It took until the 87th minute for Kilmarnock to grab the winner, with Matt Kennedy squeezing home the winner past Joe Hart.
More to follow...