Lyrics include: "Little girls, listen closely, 'cause no one told me, but you deserve to know. It's an incredible song".
But in recent years she's had success with the likes of A Great Big World on Say Something and Maroon 5 on Moves Like Jagger. "We went through a few names of women. I needed a belty singer, and she took it to the next level", Aguilera said.
"I remember being at her concert and singing facing the crowd instead of the stage, knowing that that was exactly what I wanted to do in life".
The powerful four-minute vocal summit ends with the two women ad-libbing runs over a man's tiresome voice ordering: "one, two three, shut your mouth, stuck your ass out for me, march two three, who told you your'e allowed to think", even as they soar above his noise to jointly pledge to never fall in line. Demi and Xtina followed each other on Instagram shortly after, with Demi citing Christina as the main influence behind her latest album Tell Me You Love Me around the same time. "It's such an honor to lend my voice to this anthem for women with one of the most inspiring individuals I've ever met".