Celtic were swept aside by a rampant Paris St-Germain, who hit seven in the Parc de Princes.
The visitors opened the scoring in the first minute through Moussa Dembele, but were then swamped.
Neymar scored twice, then created the third for Edinson Cavani, before Kylian Mbappe struck before half-time.
Marco Verratti, Cavani and Dani Alves scored in a five-minute blitz in the second half to compound Celtic’s misery.
The victory was PSG’s biggest win in the Champions League, and a chastening night for the visitors, who lost 5-0 to PSG at home earlier in the group.
The Scottish champions still have the advantage in the race to finish third in Champions League Group B, with bottom-placed Anderlecht losing 2-1 to Bayern Munich.