The Bhoys were behind on the stroke of half-time when Lawrence Shankland silenced the home crowd with a clinical header, but Celtic instantly went down the other end to equalise from the penalty spot through Arne Engels.
Martin O'Neill's men then threw the kitchen sink at Hearts in search of the title-winning goal, and it was Diazen Maeda who delivered the decisive moment minutes from time, as he was in the right place at the right time to tap in Callum Osmand's cross.
Maeda's goal sparked scenes of pandemonium inside Celtic Park, with thousands of fans streaming onto the pitch when Osmand raced away deep into injury time to tap into the empty net and break their opponents' hearts.
It was a comeback fitting for a season that has seen Celtic bounce back from multiple dark moments, including the appointment of Wilfried Nancy, with O'Neill's arrival in January proving to be the turning point in their season.
The Irishman returned to the club when they were six points behind Hearts, and he's now just delivered arguably their most satisifying title yet.
Alistair Johnston already wants his success recognised, urging the club to build him a statue outside of the ground.
"There are no words to describe it. What in the world was that, it’s the best feeling ever when you realise you have an empty goal and you are running it in," Johnston told Sky Sports.
“It is the greatest league win of all time and we have won a lot of leagues here. There is something about this club.
“Martin O’Neill is a winner. You’ve got to build him a statue. He just finds a way to win and it has been unbelievable playing for him this year and I’m just so happy we are able to give him this and then we have a cup final to go for in a week.”
O'Neill has won 14 of his 18 league matches in charge of Celtic, but the magnificent victory over Hearts will be his sweetest this season, and arguably his career.