St Mirren inflicted Celtic's first league defeat for 12 months, beating the cinch Premiership leaders 2-0 in Paisley in the lunchtime kick-off.
Mark O'Hara headed Saints in front just before half-time and Jonah Ayunga nodded in the second goal eight minutes after the break.
The win lifts St Mirren to fourth place in the table while Celtic go into the international break with a two-point lead over Rangers at the top.
Heart of Midlothian beat Motherwell 3-0 at Fir Park to move up to third place. Lawrence Shankland opened the scoring and Alan Forrest struck twice in the second half.
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