Avril Lavigne called into Ryan Seacrest's KIIS radio show this morning, and the pop-punker from Canada sounded bright and cheery as she opened up about her American Idol guest judging experience, her close relationship with ex-husband Deryck ... “I wrote the song immediately because I was so inspired because I was designing for the movie so I had the image in my mind,” she said. “I played the song for Tim, and he loved it,