The Foxes were crowned Premier League champions after Tottenham drew their Monday night game with Chelsea 2-2, a match that Spurs had to win to keep the title race alive.
Among the first to react has been Gary Lineker, a vocal detractor of Leicester manager Claudio Ranieri's following the Italian's appointment but a fully-fledged convert and supporter as Leicester's remarkable season progressed.
The Match of the Day presenter posted a picture of himself holding a drink with the message: "Yes! Just Yes! Leicester City are champions!"
A number of former and current players including Robin van Persie and Mario Balotelli posted messages congratulating Leicester, who will receive the trophy following their final home game of the season, which is against Everton this weekend.
Then of course there were the memes...
Meanwhile the players themselves were celebrating at Jamie Vardy's house...
Leicester's game against Everton is on Saturday at 5.30pm.
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