She did seem to have something to celebrate, however, posting on Twitter: "Happy Day #NewChapter #ILoveMyJob."
Katherine famously split with her record label Warner three months ago, so perhaps a new project is in the pipeline.
She also posted a pic of herself clinking glasses with a friend, writing: "Cheers! #Celebrating."
Congrats Katherine! (Even though we don't know what you're celebrating...)
More pics of the stylish singer here: