Manchester City inflicted Chelsea's first home Premier League defeat this season in a game which began with Wayne Bridge refusing John Terry's handshake.
Frank Lampard's low strike put Chelsea ahead but Carlos Tevez equalised after a long ball was not dealt with, before Craig Bellamy shot beyond Hilario.
Tevez scored a penalty after Juliano Belletti saw red for a trip on Gareth Barry before a Bellamy tap-in.
Michael Ballack also saw red and Lampard scored a consolation penalty.
City had failed to score in their previous seven visits to Stamford Bridge, while Chelsea had only conceded eight at home in the Premier League all season.
But those statistics were rendered meaningless on an afternoon of triumph for City coach and former Inter Milan boss Roberto Mancini, who pitted his wits in the Premier League for the first time against ex-AC Milan manager Carlo Ancelotti.
City saw their hopes of silverware this season ended by their FA Cup defeat at Stoke in midweek but they boosted their prospects of a top-four finish by completing the double over Chelsea for the first time since 1957.
With Manchester United not in league action this weekend, victory would have taken Chelsea four points clear at the top of the Premier League.
But it was a disastrous afternoon for Ancelotti, whose side had only dropped points in one previous home game this season, a 3-3 draw with Everton.
What's more, his team lacked discipline after the break and were vulnerable in defence, with Hilario looking particularly suspect.
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Swansea 1 - 0 Peterborough
David Cotterill extended promotion-chasing Swansea City's unbeaten run to 12 games and pushed bottom club Peterborough closer to relegation.
Cotterill struck from the spot after Charlie Lee brought him down.
Nathan Dyer had an effort cleared off the line while keeper Joe Lewis denied Ferrie Bodde and Lee Trundle.
Lee Frecklington put a header wide for the Posh but Swansea's biggest worry was the injuries to midfielder duo Bodde and Darren Pratley.
Bodde was making his return from five months out with a knee problem and the Dutchman's exit after just 28 minutes raised question marks as to whether he was ready to play.
It was the third time in 15 months Bodde has suffered an injury to his left knee. In November 2008 he suffered cruiciate ligament damage and then broke down after eight minutes of his starting return against Sheffield United last September. 606: DEBATE
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The double-blow will add to manager Paulo Sousa's midfield woes with Joe Allen, Andrea Orlandi and Jordi Lopez already sidelined.
But the fourth-placed Swans kept their focus on the job in hand and are seven points off an automatic promotion spot and eight ahead of Sheffield United in seventh.
Peterborough remain 10 points adrift of safety and winless on the road.
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Start of the season showed Newcastle’s clear ambition not to stay too much in the second tier. Big turbulence in the club about new owner, havn’t made serious impact to the players. Six wins from eight games launched them into direct promotion zone. But, they faced a big problems with injured players, lately. Excellent striker, Shola Ameobi broke his foot and won’t be in action for a while, while midfielder Jonas Gutierrez has a hamstring injury and also remains sidelined. New face at medical service is on-loan right-back Danny Simpson who picked a knock against Plymouth on Saturday and his appearance is doubtful. Another on-loan signing (and another defender), Zurab Khizanishvili, is ineligible for the game having already played in the second round of the competition for Blackburn. Beside these missings, boss Chris Hughton intends to rest some keys for Saturday’s trip to Ipswich and will give a chance to his youngsters, like Nile Ranger, Kazenga LuaLua, Tamas Kadar, Ryan Donaldson or Haris Vuckic. For the Magpies, return in the Premier is absolute priority. In the previous Cup’s round, they were struggling and defeated League One represent - Huddersfield Town 4-3, coming from two behind on the half-time. On the other hand, they surely won’t play with the club’s name and their pride. Peterborough should be beaten and that’s something what everyone expects from this game.
Oppositely from tonight’s hosts, Peterboroug find it’s very difficult to collect points in the second tier, noticing their worst start to a season for 21 years. Three draws and same defeats from opening six rounds, with six goals scored and big ten conceded (just Scunthorpe have managed to concede more – 13). Strategy for backing on own forces hasn’t brought anything good, so far. Squad hasn’t been strengthened during the transfer market and visitors will face a tough season to avoid return to League One. However, yet they can consider themselves unlucky following a series of some good displays that have gone unrewarded. Last one was in Saturday’s draw (1-1) against favored QPR on the road. Lads showed some courage, attacked the hosts and took a lead in the opening stage of the game. Conceded a goal later, but was closer to victory. One their goal was cancelled in stoppage time and even QPR’s boss Jim Magilton said that his side were lucky to avoid defeat. Now Posh have to turn good displays in collecting the points. Well, Walkers Stadium is not the best place for improving the points balance, but maybe their luck will change. Boss Darren Ferguson will again be without his key defender Charlie Lee as his ankle injury has not yet healed and striker Ben Wright is also out.