Everyone knows that the Maid of Mischief is on her way to Gotham sometime soon, but no one is exactly sure how or when. However, the theory that Barbara is slowly transforming into Harley Quinn is gaining a little more traction, after a photo from the May 7 episode was released online.

The picture is fairly simple, as it just shows Barbara standing in her typically defiant way, with a slightly sour look on her face. However, the outfit she's donning in the image is what makes the Harley transition evident.

Barbara is seen wearing a red dress, with a black and red fur top. The colors she's wearing, paired with the light shining on her, make Barb look like she's Harley already. Her hair hasn't been colored and put into pig-tails, and her face isn't covered in paint, but the clothes and attitude she's wearing are more than enough to symbolize Harley.

When you combine this new look with the other telling factors - like owning a club called The Sirens, and acting like a psychopath on a consistent basis - Barbara is well on her way to calling a certain faceless Jerome, Mr. J.

Some rumor suggest that Barbara may not fully become Harley, but just lay the groundwork for a character that has yet to appear. This idea works, but there's just no way of telling quite yet.

(Photo: FOX)

UP NEXT: Gotham Ratings Take A Dive In Spring Season Premiere

Gotham returns next week with “Heroes Rise: These Delicate and Dark Obsessions” will air Monday, May 1 at 8pm EST on Fox.

MORE: New Preview Offers First Look At The Shaman On Gotham / [SPOILER] Is Alive / How The Riddler Got His Name / Gotham: Cory Michael Smith's First Reaction To Riddler's Costume

The regular cast features: Ben McKenzie as Detective James Gordon, Donal Logue as Harvey Bullock, David Mazouz as Bruce Wayne, Morena Baccarin as Leslie Thompkins, Sean Pertwee as Alfred, Robin Lord Taylor as Oswald Cobblepot/The Penguin, Erin Richards as Barbara Kean, Camren Bicondova as Selina Kyle/the future Catwoman, Cory Michael Smith as Edward Nygma/the future Riddler, Jessica Lucas as Tabitha Galavan, Chris Chalk as Lucius Fox, Drew Powell as Butch Gilzean, Maggie Geha as the future Poison Ivy, Michael Chiklis as Detective Nathaniel Barnes, and Benedict Samuel as Mad Hatter.

The guest cast includes James Remar as Frank Gordon and H. Foley as Winston Peters.

In crime ridden Gotham City, Thomas and Martha Wayne are murdered before young Bruce Wayne's eyes. Although the idealistic Gotham City Police Dept. detective James Gordon, and his cynical partner, Harvey Bullock, seem to solve the case quickly, things are not so simple. Inspired by Bruce's traumatized desire for justice, Gordon vows to find it amid Gotham's corruption. Thus begins Gordon's lonely quest that would set him against his own comrades and the underworld with their own deadly rivalries and mysteries. In the coming wars, innocence will be lost and compromises will be made as some criminals will fall as casualties while others will rise as supervillains. All the while, young Bruce observes this war with a growing obsession that would one day drive him to seek his own revenge as The Batman.