It seems that one of the reasons pop princess Christina Aguilera is miffed with Britney Spears, is because the 'Baby One More Time' singer refused to lock lips with her.
The 'Dirrty' singer and Spears famously locked lips with the queen of pop Madonna at the MTV Video Music Awards in 2003.
However, it seems that even though Aguilera had suggested that she and Spears share a kiss when they opened the ceremony with Madonna, the latter had turned her down.
What really put Aguilera off, it seems is that Spears had not problems doing the same with the 'Hung Up' singer.
"I was up for kissing Britney, but Britney wasn't. Although she had nothing against kissing Madonna," Contactmusic quoted her, as saying.