The brunette babe took to Instagram to make the exciting announcement.
She posted three pics of venetian blinds in a mirror (???) with the words 'BAD LIAR' written over it in what appears to be either crayon or lipstick.
According to a countdown on Sel's website, the song will be released on Thursday May 18.
Just last week, the "It Ain't Me" singer teased the reveal, writing: "Something new is coming. Sign-up to be the first to know…"
There is currently no confirmation of whether the announcement is a new diss track (perhaps aimed at JB?) or if it's 13 Reasons Why related, but we will tell you this: come May 18 our eyes will be plastered on Sel's website.
Welcome back darling Selena, we've missed you!