decided to try something different. it's bringing back the best of the best. they took to the dance floor hours ago. abc's brandi hitt has more on the premiere in los angeles. >> reporter: good morning, john, sunny. it was a packed house for "dancing with the stars" and the competition after the first night is going to be fierce. the best of the best hit the dance floor for the premiere of ""dancing with the stars" all stars." >> the judging is going to be a little tougher. >> reporter: you can tell contestants returning this year are in it to win it. six winners from past seasons are competing against seven others who fell just short of the mirror ball trophy. and because these stars have so much dancing experience already, the judges are awarding tough scores this season. >> 7 1/2. >> 7 1/2. >> 7 1/2. >> reporter: so every half point could make the difference between who stays and who goes home. for week one, the stars either dance the fox trot -- ♪