The Hammers picked up a 2-1 win against the champions.
The Hammers have looked a completely different team under Slaven Bilic, in comparison to the way they played the game under previous manager Sam Allardyce.
The ability of Bilic to get the best out of maverick players such as Mauro Zarate has been paramount and the Argentine opened the scoring yesterday. Gary Cahill pulled one back for Chelsea but West Ham's Andy Carroll secured the win with a well placed header.
But the England international, who was scoring his first goal January after a lengthy period on the sidelines with a knee injury, took to Twitter after the game to make it clear he was not the hero - but the team:
Teamwork makes the Dreamwork!! https://t.co/3o2rjL96GB— Andy Carroll (@AndyTCarroll) October 24, 2015
Plenty of other West Ham players took to Twitter to celebrate victory once the final whistle had gone as The Hammers briefly went to second in the table.
Massive win against a tough rival in front of our fans! Thanks for your support! #COYI— Pedro Mba Obiang (@Obiang14) October 24, 2015
Even those such as Diego Poyet, currently away from the club on loan, got involved.
And what a result for the boys at WH. Buzzing for all of them, 2nd in the league!!!— Diego Poyet (@diegopoyet7) October 24, 2015
Not to mention the chairman.
We beat the champions we beat a very good team with a very good manager, the result tells me, we are decent. https://t.co/tgAZ4eA3KF— David Gold (@davidgold) October 24, 2015
A good day at the office for West Ham.