Chelsea scored two goals in five minutes in the second half to take the lead and complete the comebackChelsea won a historic third successive Women's Super League title in dramatic fashion on the final day of the season with victory over Manchester United.
Sam Kerr scored two stunning volleys in the second half as Chelsea came from behind in a six-goal thriller.
The Blues, who win the league by a point over second-placed Arsenal, knew victory would give them the title.
Manchester United led 2-1 at half-time before Kerr's double and a Guro Reiten strike at Kingsmeadow.
It is the first time in WSL history that a side has won the title in three successive seasons and Emma Hayes' side can make it a domestic double with victory over Manchester City in next Sunday's FA Cup final at Wembley.
Defeat means Manchester United, who finish the season in fourth place, miss out on qualification for next year's Champions League - though they also needed Manchester City to lose to Reading.
Fans were on their feet at full-time and sang "Champions of England, we know who we are" on a magical day at Kingsmeadow which concludes one of the most thrilling WSL seasons since its introduction.
More to follow.
Line-ups
Chelsea Women
Formation 3-4-3
30Berger
7Carter4Bright16Eriksson
21Charles22Cuthbert5Ingle25Andersson
23Harder20Kerr11Reiten
30Berger7Carter4Bright16Eriksson21CharlesSubstituted forNouwenat 59'minutes22Cuthbert5IngleSubstituted forEnglandat 45'minutes25AnderssonSubstituted forJiat 45'minutes23HarderSubstituted forFlemingat 77'minutesBooked at 80mins20KerrSubstituted forSpenceat 90+3'minutes11ReitenSubstitutes
1Musovic3Nouwen9England10Ji17Fleming18Mjelde19James24Spence27AbdullinaMan Utd Women
Formation 4-2-3-1
27Earps
17Batlle12Ladd3Thorisdóttir6Blundell
14Groenen10Zelem
9Thomas7Toone11Galton
23Russo
27Earps17Batlle12LaddBooked at 11mins3Thorisdóttir6Blundell14GroenenSubstituted forBruunat 81'minutes10Zelem9ThomasSubstituted forRisaat 76'minutes7Toone11GaltonSubstituted forHansonat 65'minutes23RussoSubstitutes
2Harris4Moore8Risa13Fuso15Caldwell16Bruun18Hanson20Smith32BaggaleyReferee:Abigail ByrneAttendance:4,378Live Text
Match ends, Chelsea Women 4, Manchester United Women 2.
Second Half ends, Chelsea Women 4, Manchester United Women 2.
Substitution, Chelsea Women. Drew Spence replaces Sam Kerr.
Corner, Chelsea Women. Conceded by Vilde Risa.
Vilde Risa (Manchester United Women) wins a free kick in the defensive half.
Foul by Bethany England (Chelsea Women).
Corner, Chelsea Women. Conceded by Maria Thorisdóttir.
Attempt missed. Signe Bruun (Manchester United Women) left footed shot from outside the box is high and wide to the left. Assisted by Kirsty Hanson.
Attempt blocked. Ji So-Yun (Chelsea Women) right footed shot from the centre of the box is blocked. Assisted by Guro Reiten with a cross.
Corner, Chelsea Women. Conceded by Maria Thorisdóttir.
Attempt blocked. Sam Kerr (Chelsea Women) right footed shot from outside the box is blocked.
Substitution, Manchester United Women. Signe Bruun replaces Jackie Groenen.
Corner, Manchester United Women. Conceded by Magdalena Eriksson.
Jessie Fleming (Chelsea Women) is shown the yellow card.
Jackie Groenen (Manchester United Women) wins a free kick in the defensive half.
Foul by Erin Cuthbert (Chelsea Women).
Attempt blocked. Ji So-Yun (Chelsea Women) right footed shot from outside the box is blocked.
Attempt missed. Erin Cuthbert (Chelsea Women) right footed shot from the right side of the box misses to the left. Assisted by Guro Reiten following a set piece situation.
Foul by Hannah Blundell (Manchester United Women).
Sam Kerr (Chelsea Women) wins a free kick on the right wing.
