The Manchester City loanee scored twice in the win over the Dons.
The Bhoys were effectively champions anyway, but Ronny Deila's side made completely sure that the title was returning to Paradise with a professional job over the Dons - their closest rivals in the title race this season.
Manchester City's Patrick Roberts netted twice in the first 20 minutes to put the Hoops on the brink, with Mikael Lustig netting a third just after half time.
Derek McInnes's side pulled two goals back through Niall McGinn and Andrew Considine, though it was not enough for the Dons.
Roberts, who joined the Bhoys in January on an 18-month loan from the Premier League giants, is making quite a name for himself, and Celtic fans praised the 19-year-old for his heroics on Twitter after the game.
Roberts was a menace to Aberdeen all day today, such players need a run in the team to find their feet pic.twitter.com/sGhq1LUhIT— Lisbon Lion (@tirnaog09) May 8, 2016
CELTIC have won their 5th Premiership Title in a row with a 3-2 win v Aberdeen with games to spare. Patrick Roberts scores again.— geoff parmiter (@parmitg) May 9, 2016
Fancy/love @patrick7roberts a lot. Making the dreams come true. Love him, love Celtic— Jessie (@jesssicaking) May 8, 2016
Patrick Roberts is something else— Ross (@_RossLove7) May 8, 2016