Denmark had the perfect start when midfielder Pierre-Emile Hojbjerg intercepted the ball to feed an unmarked Yussuf Poulsen, who arrowed a right-footed shot into the bottom corner with 99 seconds on the clock.
De Bruyne then broke Danish hearts when he gave Belgium the lead in the 70th minute, receiving the ball at the edge of the box from a slick passing move and firing a left-footed shot that beat goalkeeper Kasper Schmeichel.
To make up for his efforts, Denayer had left the Denmark forward open and it was an easy finish into the far corner, celebrating ecstatically with the home fans.