Joshua King led the way with a double as AFC Bournemouth registered one of their most famous wins since joining the Premier League.
David Brooks and Charlie Daniels were also on target as Eddie Howe’s team lowered the colours of the six-time top-flight champions.
Although Chelsea dominated possession for long periods in the first half, they failed to find a way through as the Cherries defended resolutely.
King paved the way for a stirring second-half display from the hosts when he drew first blood just two minutes after the break.
The Norway international then turned provider for Brooks to double their lead before adding his second and the Cherries’ third 15 minutes from time.
Charlie Daniels came off the bench to complete the scoring with a header in stoppage-time.
Here are some of the best stats from the game.
899 – Chelsea had 899 touches of the ball compared with the Cherries’ 521. Nathaniel Clyne (58) had most touches for the Cherries, two ahead of Adam Smith.
7 – Both teams had seven shots on target.
90 – Junior Stanislas made 30 passes with a 90 per cent accuracy, the highest of any Cherries player.
13 – Nathan Ake led the way on clearances, followed by Steve Cook on 11. David Luiz had Chelsea’s highest with three.
22 – Defeat was Chelsea’s heaviest in the league since September 1996, more than 22 years ago.
2 – It was the Cherries’ second 4-0 win of the season following victory against Watford in October.
1 – Chelsea tasted defeat at Vitality Stadium for the first time in the Premier League.
30 – Victory was the Cherries’ first home league win against Chelsea for more than 30 years.
9 – Three wins have earned the Cherries nine points against Chelsea in the Premier League, their best tally against the big six (Arsenal 4, Liverpool 4, Manchester United 4, Tottenham 1, Manchester City 0).
3 – The Cherries have recorded back-to-back wins on three occasions this season (Chelsea/West Ham, Crystal Palace/Watford, Cardiff/West Ham).
8 – The Cherries have scored four or more goals eight times in the Premier League (Chelsea 4-0, Watford 4-0, Leicester 4-2, Huddersfield 4-0, Hull 6-1, Liverpool 4-3, Middlesbrough 4-0, West Ham 4-3).