On loan Manchester United striker James Wilson netted just six minutes into his first Aberdeen start to secure a 1-0 win over Motherwell.
Celtic fully deserved to win the Scottish Cup on Saturday.
The Dons bowed out of the Scottish Cup in dismal fashion as they were beaten by Motherwell at Hampden in the semi final.
Aberdeen lost further ground on league leaders Celtic as summer transfer target Louis Moult smashed a double in a 2-0 defeat to Motherwell at Pittodrie.
Aberdeen responded from their League Cup disappointment by beating Motherwell 1-0 at Fir Park.