Joe Jonas, who fronts DNCE, posted a clip of the performance to Instagram, with a cheeky (and just a little bit smug!) caption. Watch that go down below. Tyler was revealed as the cruise's headliner, and of course, she will be singing the song during the eclipse, and probably over and over again throughout the rest of the night.
Interest in Tyler's signature song typically surges whenever there is an eclipse - which happen on average every year and a half somewhere around the globe. 2024, when the USA will have another brush with a solar eclipse's path of totality.
Even more excitingly, "Total Eclipse of the Heart" - which has an astonishing 307 million views on YouTube - has just knocked Luis Fonsi and Justin Bieber's summer anthem "Despacito" off the number one spot on USA iTunes.
This event will take place on the Royal Caribbean's Total Eclipse Cruise, which will allow passengers to have a perfectly positioned view of the solar eclipse.
The cruise travelled through the path of the totality. The song passed "Despacito" on iTunes during the eclipse on August 21, 2017.
It even managed to overshadow the song of the summer Despacito, which is now the most-watched video of all time on YouTube.
Earlier in the year, "Total Eclipse of the Heart" was selling about 1,000 downloads a week, according to Billboard.