Ricardo Vaz Te was West Ham's hero after his late goal sealed the London club's return to the Barclays Premier League.
Vaz Te struck with three minutes remaining as the Hammers' first visit to Wembley since 1981 ended in a 2-1 victory over Blackpool in the npower Championship play-off final.
Carlton Cole had given Sam Allardyce's team the half-time lead but the Seasiders, promoted via this route two years ago, equalised early in the second half through Thomas Ince.
Ian Holloway's side had much the better of the opening exchanges, with Matt Phillips missing two chances, but it was the London side who took the lead after Carlton Cole deftly controlled Matt Taylor's diagonal pass and slotted the ball past Matt Gilks in the 34th minute.
Thomas Ince, son of Paul and booed throughout the game by West Ham fans, drew Blackpool level after getting on the end of a cross-field pass and squeezing past his marker, Winston Reid to guide the ball past Robert Green.
Blackpool had the momentum, were keeping possession and soaking up West Ham pressure. Things did not seem to be going the Londoners' way, especially when Gilks turned a fine Kevin Nolan volley on to the bar.
However, Cole got in the way of Gilks and a loose ball fell to Vaz Te, who lashed the ball into the roof of the net.
