Though both Lady Gaga and Katy Perry have repeatedly insisted that they are not competing against each other, it looks like Mother Monster may have had a change of heart. Gaga threw some pretty obvious shade at the 'Dark Horse' singer last night, taking to Twitter to sub tweet Perry's Prismatic Tour garb:


Yikes! The tweet is a clear dig at Perry, considering she just dyed her hair "slime green" (and dons a green wig during the show) and rides a mechanical horse onstage during her Prismatic World Tour, which she just kicked off in Belfast, Ireland just this week. Of course, the other element of the tweet is that Gaga seems to be accusing Perry of copying her, considering Gaga rode a white mechanical horse onto the red carpet at the 2013 American Music Awards and recently rocked some green neon hair herself.

While Katy Cats might be angry at the shade thrown by Gaga, if Perry's past words are any indication, she wouldn't want them to stop listening to the 'G.U.Y.' singer solely on her behalf.

“Sometimes, it keeps me on my toes as a performer," Perry said about the supposed "competition" between her and Gaga. "It’s nice to have that. But we both agree that we don’t like the competitive nature and we don’t encourage it from our fans because you are not going to listen to one artist your whole life. You’ll listen to a medley of different artists.”

For her part, Gaga was a bit more blunt, expressing her frustration at the constant comparison:

“I don’t know what the f–- I have to do with Katy Perry,” Gaga said during SXSW. “My music is so completely different and I couldn’t be more different.”

And it looks like the mechanical horse and green hair are two differences that Gaga wants to keep.

Katy Cats + Little Monsters, what do you think of Lady Gaga's tweet to Katy Perry?