Bellamy and McGeady torment Thistle
Inverness started brighter and Roy McBain had ambitious 30-yard drive saved by Douglas after only 30 seconds before Celtic took the initiative and Hartson had an appeal for a penalty turned down following a strong challenge from Darren Dods.
McGeady left the opposition defence in his wake after nine minutes before chipping the ball to the back post area only for Stilian Petrov to head wide.