Doesn’t surprise me that much as there’s a video of her singing it
https://youtu.be/gFi7_LFG7OA
It surprises me because that video was 12 years ago and her performance in Hairspray only served as evidence that she doesn't plan to sing outside her scoopy Idol Xerox-pop LA studio style. If she performs more Broadway-legit for the concert, it could be a pleasant surprise, but so far, these casting announcements only generate more apathy in me. Even the idea that anything deserves a "15th Anniversary" concert seems oddly forced. It's not like 15 is generally considered a celebratory milestone. It reminds of the hoopla over the 5th Anniversary recording re-release.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian