Oh, how the time flies! Remember when Adam Lambert was just a contestant on American Idol, and now he's a judge himself! Filling in for Keith Urban, Lambert paid a visit to Jennifer Lopez and Harry Connick Jr. on the set of the New York auditions of American Idol. Lambert tweeted, "What a fun day guest judging on @AmericanIdol! @jlo and @HarryConnickJR r SO fun 2 work w. Def a few potential Stars that auditioned today!" Sounds promising!