That all changed because Lovato FINALLY stepped in front of Xtina and documented it on Instagram.
"Guys, I'm about to meet Christina Aguilera for the first time in my whole life and I'm so excited. I can't f*cking wait," she said, with the most appropriate video emojis ever: ??????.
She followed that up by saying how amazing the "Accelerate" singer was.
Xtina got in the action too, posting a cryptic photo showing the back of her head as she seemed to be deep in conversation with Lovato.
All we can say is ... this is about time. The ladies have already recorded their song, "Fall In Line," and on Tuesday it was announced they'll be performing together at the Billboard Music Awards on May 20.
"Dreams really do come true," Lovato tweeted after the Billboard news broke.