The Community Shield was the first match of the season for Manchester City and they lost.
The FA Cup winners were pipped to the title by a single point, but came out on top in a great game inLeicester.
Wembley will host the Women's Euros final on Sunday, but the two teams played at the King Power Stadium.
Reds full-back Trent Alexander-Arnold scored the opening goal with a curling effort from the edge of the box which went in off Nathan Ake and into the far corner.
He celebrated by raising his finger to his lips in front of the City supporters.
Erling Haaland drew a good save from Adrian, while Nunez had a one-on-one attempt kept out by Ederson.
After Phil Foden's shot was saved and the goal was awarded after a lengthy VAR check, it was another newcomer who scored the next, keeping an eye on the ball as it trickled into the net.
After watching the pitchside monitor, referee Craig Pawson decided that Ruben Dias had handled inside the area and awarded the penalty to the Reds.
He stooped to head in from close range and celebrated in front of his fans.
Even though they won the Carabao Cup and FA Cup, they missed out on the league by a single point and were beaten by Real Madrid in the final of the European Championship.
The Reds were back in action against the side that they had lost to in Paris just 63 days before.
The Reds came out flying, hassling and harrying the City backline, and they struck the side-netting in the third minute, thanks to a great save by the City goalkeeper.
Alexander-Arnold broke the deadlock with a curling effort after Andrew Robertson headed into the side-netting.
In the red end of the ground, the fans lit flares and filled the stadium with smoke, just as they did at Wembley after their FA Cup victory.
The replacement for Sadio Mane was brought on just before the hour mark and the other was brought on just before the end of the day.
He hit his shot straight at Ederson after he latched on to Jordan Henderson's perfectly weighted through ball.
He was involved in the goal as his shot hit the arm of Dias inside the box, and the Egyptian netted the penalty.
With time running out, the £64m man sealed victory to complete the domestic trophy set for the boss.
Manchester United have lifted the trophy in three of the past four seasons, but City want to become the second side after them to win four in a row.
The chants of "You nearly won the league" prompted a riposte from the City fans.
In the closing weeks of the season, they were hoping for a Treble of their own, but they were knocked out in the semi-finals of the FA Cup byLiverpool and the European Championship by Real Madrid.
Following the departures of Gabriel Jesus and RaheemSterling, the acquisition of Norway international Haaland gives them a different aspect up front.
Haaland outmuscled Robertson in the first half, taking the ball down on his chest only for his side-footed shot to be turned away by Adrian, then he could not get a good connection on a stretching effort.
After coming on, the Argentina international highlighted the options that the coach has at his disposal.
Haaland missed a sitter in the last minute as the joy was short-lived.