News Happy 30th Birthday Katy Perry! Watch Her Greatest ET Moments By Ashley Crossan 4:00 PM PDT, October 24, 2014 ETONLINE Katy Perry is turning 30! In celebration of her Oct. 25 birthday, we’re diving into the ET vault and looking back at some of the greatest one-liners Katy has ever given us.Like when she graciously offered us some refreshments. ETONLINEAnd when she found out Audrina Patridge was dancing to her song on Dancing With The Stars.ETONLINEAnd when she perfectly sassed her 92-year-old grandmother. ETONLINEWell that’s what makes us love her so much, right?Check out this video for more Katy Perry moments through the years – and happy birthday, Katy!VIDEO: Katy Perry is the Super Bowl Halftime Performer!