It’s always the... loud ones.
Throughout pop history, whenever two female artists have been pitted against each other, tradition decrees that one must be sweet and innocent, and the other naughty and scandalous.
Tradition then further decrees that it will later turn out that the allegedly angelic party was actually the one getting up to all sorts.
Take, for example, God-fearing good girl Whitney Houston , and mistress of controversy Madonna .
If you’d have put money on which of them would battle drug issues and die young, and which would still be working hard at sixty, you would have lost that money.
And so, in perfect keeping with this theory, while Britney Spears ’ life continues to be, um, complicated, Christina Aguilera - a woman previously so Dirrrty she needed extra consonants - performed a flawless live show in Amsterdam.
Warming up for her UK tour in November, Christina nailed it on stage at Amsterdam’s Ziggo Dome, belting out hit after hit after hit.
Genie In A Bottle, Fighter, Beautiful – it was all killer, no filler.
And after the concert, if anyone in Amsterdam’s infamous Red Light District happened to see a blonde pop star letting her hair down and partying hard with her entourage?
Well that must have been Britney of course...
And while it's been more than two decades since Christina Aguilera shot to fame as a , she's barely changed over the last 25 years.
Since kicking off her career with debut single Genie In A Bottle in 1993, she's gone on to release eight albums, tour the world and become mum to two kids.
Despite such a long career in the public eye, Chrissy, 38, still looks incredible - now a top surgeon has revealed how the singer has maintained her ageless beauty.
A top surgeon for MYA Cosmetic Surgery told us Christina is likely to have undergone a variety of procedures to battle those dreaded wrinkles.
