Celtic suffered a first defeat in ten games as Hibernian secured a 2-0 win at Easter Road to put a dent in the Hoops' Ladbrokes Premiership ambitions.
Midfielder Vykintas Slivka got the home side off to a dream start when he finished off a fine move with just 46 seconds played and in the 59th minute striker Florian Kamberi hammered in a clinching second
It was Celtic's first league defeat in 10 matches and they remain one point behind Kilmarnock albeit with two games in hand and with Rangers able to leapfrog both against Hamilton later on Sunday.
Rejuvenated Hibs won for the first time in eight games last week against Hamilton and will see this victory as confirmation of a return to early-season form.
However, it has been a mixed few days for Brendan Rodgers' side who qualified for the last-32 of the Europa League on Thursday night despite a 2-1 defeat at Parkhead by Salzburg.
They had no time to settle into the game as the returning Steven Whittaker and Emerson Hyndman combined for a stunning opener.
A sweeping move started with Whittaker brilliantly working himself out of the right-back position before feeding Hyndman, who moved it on to Oli Shaw.
When he switched the ball back to the right-hand side Slivka controlled it on his right foot, moved it on to his left past Parkhead defender Jozo Simunovic and then curled it past Hoops keeper Craig Gordon into the far corner.
With Celtic's defence posted missing, Mackie's long diagonal pass found Kamberi running past Brown and the Hibees attacker sped into the box before thrashing the ball high past Gordon to stun the champions.