Hatters promoted to the Championship after Posh beat Pompey!
Going into the game, the hosts needed a win to set up a final day decider, but they got off to a poor start trailing 2-0 to goals from Lee Tomlin and Ivan Toney inside 30 minutes.
However, Ben Close pulled one back on 38 minutes, before Christian Burgess levelled the scores with an hour gone.
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Hide AdToney then netted again with 15 minutes to go to put the Hatters on the brink and after five minutes of injury time, the full time whistle ensured Mick Harford's side had done it.
Fourth-placed Sunderland also lost, going down 2-1 at Fleetwood meaning that they also are in the play-offs.