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I'm not saying Britney is that relevant nowadays but she surely is more than Christina.
Britney achieved 2 #1 singles this decade which one was a SOLO HIT.
She had an album which sold more than 2 million copies this decade,something Xtina is yet to achieve.
Also her hits are more remembered today than Xtina's.
This thread will end when i want to.
You also forgot to add that Christina hasn't a successful album or hit since like what? 2006? Her last #1 solo single was in 2001 and she doesn't tour since 2007.
But besides that yes she's super relevant