Second-half goals from Lyndon Dykes and Scott Robinson saw Livingston stun 10-man Celtic 2-0.
Celtics unbeaten launch was ended by a Livingston facet who outfought and outplayed their visitors – and their lead on top of the Scottish Premiership might be gone at the end of the evening also, with Rangers place to leapfrog them into first should they beat Hamilton from the 3pm kick-off.
The Bhoys task wasnt assisted by the needless red card for a high challenge on Robinson, which left him needing remedy of Ryan Christie.
Robinson would have his revenge Neil Lennons side after the break, beating on Fraser Forster having a fine finish two minutes into the second half after an Robbie Crawford pass.
And the hosts doubled their lead if Dykes latched onto a ball before lifting the ball Forster, before holding firm to secure their first win over Celtic in the attempt.
More to follow…