Britney Spears' Pop Rivalries, From Christina Aguilera To Lady Gaga

'She's sort of left a lot of these girls in the dust,' one Spears expert tells MTV News.

For more than a decade, Britney Spears has been pitted against some of her pop peers, including Madonna, Jessica Simpson, Christina Aguilera and, most recently, Lady Gaga.

She's publicly buried the hatchet with Madonna and Aguilera — sharing a three-way kiss with the pair at the 2003 VMAs — and never really paid much attention to the hype of other so-called rivalries.

"Since the beginning of her career, she's always been pitted against whatever big pop person there is," MTV News' Jim Cantiello explained.

"I feel like artists have had rivalries with Britney and she hasn't really had rivalries with them," Entertainment Weekly's Leah Greenblatt added. "She's sort of left a lot of these girls in the dust."

While Brit has managed to stay on top all these years, a new pop princess might give her a run for her money. "I think Gaga's already been talking about what she is gonna do. She has said that her album is going to be more than just dance songs, and I'm guessing that Britney might be making a different type of album, which is great, because in that sense, Brit and Gaga don't have to compete," Perez Hilton said of any potential new rivalry. "They're each doing their own very distinct thing."

Greenblatt agreed: "It just seems like they're operating on different wavelengths right now. I mean, Britney's proven herself over such a longer period of time than Gaga has. I don't think that Gaga can just wipe her off the pop royalty board."

At the end of the day, it's not at all about competition, Cantiello explained. "Britney's going in the super dance route and Gaga's doing a super personal album," he said. "It comes a point where we've got to stop comparing the two."

Plus, it's hard for these two to really ever compete with one another, since Gaga has admitted to waving the Britney flag. "I was 13 when Britney became a star," she said in 2009. "I was amazed by the level of the superfan that Britney created. I want to bring back the feeling that I used to feel."

Who has been Britney's worthiest adversary? Share your thoughts in the comments!