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Katy Perry, Lady Gaga

Courtesy of SPE, Inc./Michael Buckner, Todd Williamson/WireImage

Uh-oh, it looks like Lady Gaga might be taking a jab at Katy Perry.

After participating in a little Twitter Q&A with fans, Mother Monster tweeted, "It looks like green hair and mechanical horses are the thing now [eyeballs]," which may seem a little odd and random to some, but those who saw photos from Katy's concert last night in Belfast quickly drew a connection.

Perry kicked off her Prismatic World Tour in Ireland Wednesday, and one of her numerous (and wacky!) costume changes requires her to wear a short, bright green wig.

Katy Perry

Christie Goodwin/Getty Images

Oh, and whaddya know? Another portion of her show has her riding a mechanical horse. Coincidence? We think not.

Let's not forget that Gaga has rocked green hair in her time (with the most recent being a shoot with photographer Terry Richardson) and arrived to the American Music Awards last year on a huge mechanical white horse.

Gaga and Katy have often been seen as rivals on the music scene, which would make a little shade-throwing understandable. However the ARTPOP singer recently (kinda) debunked feuding rumors during her SXSW keynote speech at the Austin Convention Center in Texas. "I don't know what the f--k I have to do with Katy Perry. My music is so completely different and I couldn't be more different," she said.

Maybe not that different.

Katy Perry

Christie Goodwin/Getty Images