It’s been quite an emotional week in the world of Britney Spears.

After finishing up a “fabulous” new song with William Orbit and unveiling a countdown to…something last night (for more, check out the breakdown), the “Born To Make You Happy” beauty got a little verklempt on Twitter tonight regarding a new song she’s just recorded with Sia — not to be confused with the other song she already wrote with the “Titanium” powerhouse belter.

Yesterday, Sia heard Britney’s vocals on the track and promptly shook and cried on Twitter.

And tonight, Britney responded.

“Beautiful and heartbreaking”? Sia’s got that covered, time and time and time again. And of course, so does Britney.

Danceney’s taking a breather on Album 8. You ready to get a little Emotionalney?