Leicester came from behind to blow Tottenham away at the King Power Stadium, as Brendan Rodgers side continued their resurgence up the Premier League table.
The Foxers had fallen behind to Rodrgio Bentancur's early strike, before Nampalys Mendy, James Maddison, Kelechi Iheanacho gave the hosts a half-time advantage.
Harvey Barnes completed the scoring in the second half as Leicester made it an unhappy return to the dugout for Spurs boss Antonio Conte.
The result continued Tottenham's mixed form ahead of their Champions League last-16 tie against AC Milan.