Halsey took her fake tits out for some air. It's true. You have to expose them to the elements once in a while to regulate their temperature so they don't shrink or expand as the temperatures outside get colder or warmer.
It was either that or some meeting about some piece of crap movie she's in called, "If I Can't Have Love, I Want Power" which nobody, and I mean nobody, will ever see. You see, production studios need tax write offs to offset the profits of more successful movies so they make shitty movies with talentless pop stars, release them into a few theaters/streaming services and then put them on a shelf in a vault somewhere and say it was a failure.
The reason is two fold. They can spend/keep money they would otherwise have to send to the government, and it's also a PR move so the dummies that like Halsey and buy her music, will hear about this and remember the movie studio was nice to Halsey so they'll go see the next terrible superhero movie they release. It's not as Machiavellian as it sounds, movie studios have been doing this for 100 years.