I caught up with Katy on Saturday night at the Palladium in Hollywood, just before she hit the stage for her show (presented by SoundsofBuzz.com and Coca-Cola).
"Every time I met him, he was such a wonderful person, full of life, very bright," she said of the late DJ. "It continues to remind everybody to live life to the fullest [and] love the people around you."
(Make sure to come back here later today to find out what Katy had to say about her upcoming gig as a guest judge on American Idol.)
Read about Blink-182's tearful tribute to DJ AM in our story "Travis Barker Will 'Never Forget' His 'Brother' DJ AM."