WHETHER an experiment or a lifestyle, girls canoodling with girls has always been hot – especially in rock. Just ask Katy Perry, music’s latest It girl with her hit “I Kissed a Girl.”

The stats are already impressive for this tune, poised to be this summer’s song. Perry’s kiss-and-tell anthem is the lead single from her upcoming album “One of the Boys,” due out Tuesday. The number is already the No. 1 pop single on iTunes, the most requested song on Top 40 radio nationwide and the most downloaded ringtone in America.

But besides the song’s familiar theme – popular in art since the sixth century BC when the poet Sappho expressed her love of women in lyric verses – Perry’s song (although completely different) snatches its title from Jill Sobule’s controversial 1995 folk-rock hit “I Kissed a Girl.” dan.aquilante@nypost.com