I can totally relate to you! As a teenager, I was a huge Katy Cat (i think this was the name for her fandom). Then I lost my interest because I discovered new genres of music, but Katy Perry always reserved her place in my heart and memories. Recently, I stumbled across her new music and fell in love & got through the same nostalgic feelings. It also feels a bit weird and unbelievable that she's given birth since it makes me feel old :)