The Algerian had been a target for Man City on the final day of the January transfer window.
His first came from some neat play down the left, which led to a precision cross into the six-yard box from where Aguero made no mistake.
It did not take the home side long to establish an advantage, Sterling tapping in from close range following an exquisite De Bruyne cross between Schmeichel and his defenders.
Victoria Beckham rules out Spice Girls reunion tour
A source also told TMZ , "They are worth more as a group than they are individually, so this is a great venture for all of them". She added, "There's something so strong in the message of what the Spice Girls stood for". " It was so great to see the girls ".
Argentine striker Aguero netted all his goals in a devastating second-half showing - twice finishing from Kevin de Bruyne's flawless passes, punishing a Kasper Schmeichel error by chipping into the net and curling in a sublime fourth.
Mahrez's sudden U-turn could see Puel provide him with the flawless platform with which to show City why they should maintain their interest when the transfer window reopens in the summer.
The Argentine converted De Bruyne's teasing cross in the 48th minute and collected another pass from the Belgian to fire through Kasper Schmeichel's attempted save.
After controlling the first 20 minutes, City were suddenly rocked as the visitors hit back out of nowhere.
Many pundits, including Neville and former England captain Alan Shearer, interpreted Guardiola's decision as a protest against a number of risky challenges made on City players during recent matches.
Jammu woman dies in shelling as Pak violates ceasefire again
At least 10 Pakistani soldiers and 9 Indians have died in ceasefire violations on the LoC this year, Hindustan Times reported. Pakistan army violated the ceasefire again and the incident took place at 10:35 PM, yesterday night.
Pep Guardiola has insisted Manchester City are not to blame for Riyad Mahrez's absence from Leicester City training. They play more, they play between channels and have more passes.
But after the break they were transformed as Sergio Aguero and Kevin De Bruyne put on an attacking masterclass to help the runaway leaders rout the 2016 champions 5-1. The pace of Vardy was being utilised less in the second half, perhaps due to a change in the nature of City's defending, but even on the counter they didn't look quite as threatening as they had done.
And a Nicolas Otamendi error 24 minutes in was punished in ruthless fashion by Jamie Vardy, reminding City there is more to Leicester than just Mahrez - who was eventually introduced in the 62nd minute. It was a brilliant way to grab his third goal, and finished off Leicester completely in emphatic style.
Mahrez has been unavailable for Leicester's last two Premier League matches, but the winger says he was not AWOL as had been widely reported.
Will campaign for TMC if Mamata Banerjee calls me: Hardik Patel
Patel thanked Mamata Banerjee for her invitation and asked her to visit Gujarat once."She has come to power after a long fight". Patel said "I will definitely come as Didi has urged me to campaign for Trinamool Congress in the 2019 Lok Sabha elections".