Goals from Yann Kermorgant and Dale Stephens saw Charlton secure the League One title after beating relegation-threatened Wycombe.
Kermorgant opened the scoring with a 30-yard free-kick but Stuart Beavon levelled, heading home Marvin McCoy's cross at the back post.
The Addicks won it when Kermorgant headed Rhoys Wiggins' centre back across goal for Stephens to fire home.
Wycombe are now three points from safety with two games left to play.
VIEWS FROM THE DRESSING ROOM
Charlton manager Chris Powell told BBC London 94.9:
"There are no tears today, I am just so happy and proud for everyone, it is a great moment and a great feeling.
"Everyone can celebrate, we had a great moment at Carlisle last week and we have had it again today.
"But in two weeks' time it is party time for this club. I told them, make sure we are champions, the pressure hasn't let up and we have been strong all the way through.
"We are champions and that is a great feeling."