Pompey were beaten in their final Fratton fixture of the season before lifting the League One trophy.
A 2-1 defeat to Wigan mattered little in the grand scheme of things, with fans eagerly awaiting the celebrations that accompanied the final whistle.
Luke Chambers opened the scoring for the visitors before Sean Raggett and Marlon Pack both went close to levelling.
Josh Magennis increased the deficit and although Kusini Yengi pulled one back for John Mousinho's men, they could not find a leveller.
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