The Hoops' stand-in skipper scored in between a Gary Hooper double with Georgios Samaras, on for Anthony Stokes, netting with a virtuoso goal two minutes from time before Aaron Doran got a late consolation for the visitors.
It was the midfielder's second consecutive title win since joining the Parkhead club from Cardiff in 2010 and he has the chance to win a second William Hill Scottish Cup winners medal next month when Celtic face Hibernian in the Hampden final.
And the 26-year-old could not be happier with the pressure of always having to produce.
"Winning does become a bit of a habit," he said. "It's the hardest thing - going out there and winning games.
"When you join a club like Celtic it takes a while but you grow into it and then that's all you want to do.
"We're a young squad - and very hungry - and I think that's what you need in a team. Everyone wants to win and when we don't win there's a few arguments and things like that.
"We're winners at the end of the day and that's what we want to do.
"The pressure to win is the best there is. It's no good going to a club that's mid-table or fighting relegation and thinking 'let's go here and get a point or hang on'.
"At Celtic, wherever you go, whether it's in the league or the Champions League, you are always under pressure to win. That's what you want as a footballer - to win things."
- Sports & Recreation
- Anthony Stokes
- Georgios Samaras