Idol: Kate Perry and Avril Lavigne Guest Judge

Avril Lavigne and Katy Perry joined the American Idol judges Tuesday in Los Angeles, and the starlets showed sass, saying no to hopeful singers when the judges — even Simon Cowell — said yes. Katy even clashed with Kara DioGuardi, mocking her at times and threatening to throw a Coke in her face when she shot back.

But the real battle was for golden tickets. Jim Ranger, a 27-year-old pastor with three kids, sang his own song, “Drive.” and made it through despite concern from a devilish Avril that he wouldn’t be able to handle being a pop star.

Simon said Mary Powers, who sang a Pat Benatar song, was “a little cliché.” But she got unanimous praise for her stylish voice and scored a ride to Hollywood. She then brought her 8-year-old daughter into the audition room to say hello to her favorite judge, Simon. It was a cute moment from the bristly Brit.

Musician Andrew Garcia, who is also a parent, blew the panel away with his soulful performance. Simon said he was “the only person [of the day] who I believe is genuinely good singer.” Katy told him, “You gave me chills,” and he was sent through to the next round.

PEOPLE