The 'Beautiful' hitmaker found it difficult when the pair appeared to be put against one another and admitted it was very hurtful to be portrayed as the ''bad girl''.
She told the September issue of Cosmopolitan magazine: ''It's hard to hear yourself being called names. I remember being hurt by these commercials on MTV, pitting Britney as the good girl and me as the bad girl. It's like, if I'm going to be demure and innocent, that's OK. But if I'm going to just be myself, I'm trouble.''
However, there is one person Christina has feuded with - Pink, who she fell out with back in the early 2000s, leading to the pair trying to punch each other in a nightclub.
She said: ''We were super young and super new at the whole thing, and I think I'm an alpha, and she's an alpha. I'm used to taking my altercations physical and she's used to having them verbal. We're just very different, we're very different. And we were very young and new. You have to learn - women have to learn how to support each other. It's not taught to each other in the playground.''
Asked if she had ever tried to turn their arguments physical, she added: ''Actually, she swung at me in a club. Hilarious! I was like, 'What's happening right now? What's happening?'''
And Pink thinks becoming parents helped herself and Christina resolve their differences.
Asked how they managed to get over their feud, she shared: ''We became moms. We grew up. We hugged it out. It's that simple. I feel so good about that.''