Katy Perry vs. Lady Gaga: The Singles
First No. 1s: Katy Perry's "I Kissed a Girl" vs. Lady Gaga's "Just Dance"
With a whiff of cherry chapstick, Katy Perry flirtatiously made her way onto the charts (and into our hearts) with mischievous "I Kissed a Girl" in late April 2008. Lady Gaga's first impression was one made on the dance floor earlier that month.
- Katie Hasty