Such a big fan that she even did her own parody version of Billie's song "Bad Guy" (which is an absolute bop btw).
In fact, Melissa clarified how much of a fan she is of Billie during a recent guest-hosting slot on The Ellen Show, where she said: "I love her, I'm completely obsessed with her. We listen to her all the time. In fact, if you don't like her, just get up and get out."
Of course, when Melissa recently made another appearance on The Ellen Show, this time to promote her upcoming movie The Kitchen alongside costars Elizabeth Moss and Tiffany Haddish, Ellen wanted to discuss the whole Billie obsession.
This time, however, there was a little surprise in store — hi Billie!
This picture needs to be framed and hung in the MoMA.
Closer inspection reveals that both Melissa and Elizabeth were absolutely terrified. Tiffany was a little less shook.
Once she got over the shock though, Melissa looked pretty happy with the surprise, even if she did originally think Billie was Santa popping out of the box.
Billie revealed that keeping the whole thing a surprise from Melissa was difficult, especially considering they both arrived on set at the same time.
And Melissa also revealed a cute fact — Billie's mom, Maggie Baird, was her first ever improv teacher. What a small world!
You can watch Billie scare the crap out Melissa for yourself right here.
