Hey sista, go sista, soul sista, go sista…

Pink has been performing on stage since she was 14 years old. Always the wild child, her fiery personality was bound to land her into at least one celebrity feud. Since 2001, she’s been on the outs with Christina Aguilera. Now the 38-year-old spills the tea on Watch What Happens Live With Andy Cohen.

While the feud between the two superstars didn’t start as anything personal; it was an ego thing. The two appeared to be professional in public, but below the surface they were secretly waging war over music.

It started back with the unforgettable 2001 hit, “Lady Marmalade,” for the Moulin Rouge!soundtrack. The divalicious track featured both stars alongside Lil’ Kim and Mya.

In VH1’s Behind the MusicPink recalled saying to the label’s executive.

Read more: