Cook, Kris and Adam perform on 'Good Morning America'

It was an all-Idol affair on this morning's episode of Good Morning America, as David Cook, Kris Allen and Adam Lambert each performed as part of the program's Summer Concert Series in New York City's Central Park. Just one week after Kelly Clarkson headlined the same concert, the three male alums took to the stage to perform either their current single (in the case of Cook) or a song from the current "Idols Live!" tour (in the case of Kris and Adam). Watch the performances below:

Cook's "Come Back to Me"



Adam's "Starlight"



Kris' "Heartless"



Both Kris and Adam are in town to perform in concert with the rest of Season 8's Top 10 finalists as part of the Idol tour at Atlantic City, N.J.'s Boardwalk Hall tonight and the Prudential Center in Newark, N.J., tomorrow and Sunday. Cook is currently in an in-between period and will resume his tour on Wed., Aug. 13 at the Verizon Center in Washington, D.C.