The words, "It's time to get out the big ballons" is a reference to the lyrics of Katy's song "Birthday."
But did Ellen go too far? Lots of uptight
Namely, a bunch of men who are complaining that this is sexual harassment or reverse sexism or something. They are saying that if a man tweeted this, he would be accused of sexual harassment. (There are samples of outraged tweets at the source, I didn't feel like wasting the energy on men.)
Was Ellen sexist to Katy?
Source, Source, Source