Lady Gaga feels Katy Perry is ripping her off on the creative side. Though she recently squashed rumors the pair had beef, Gaga threw shade at the "Hot and Cold" singer yesterday.

Perry kicked off her "Prismatic" tour in Belfast, Northern Ireland last night sporting green hair. Gaga decided to go green recently for a Terry Richardson shoot, and rocked emerald locks in 2011.

Another similarity? Perry used a gold mechanical horse prop for her "Dark Horse" performance, channeling Egyptian themes. Gaga rode a white mechanical horse to enter last year's American Music Awards.

Though Perry's ideas appeared different, Gaga could not help but tweet how she felt to her Little Monsters.

"It looks like green hair and mechanical horses are the thing now," she wrote.

In March the rumor mill was tipped when the singers released new singles on the same day (Perry's "Roar" and Gaga's "Applause").

Gaga then took the stage in Austin, Texas for a SXSW keynote speech and slammed the rumors of bad blood.

"I don't know what the f*** all I have to do with Katy Perry... Our music is so completely different. I couldn't be more different, really," Gaga said.

She also told Ryan Seacrest, "I really like Katy Perry and I like her fans."

Perry has yet to respond to the diss. She rocked several crazy costumes for last night's show at the Odyssey Arena. The songstress will perform in Europe until June before making her way back to North America.

"Um...It feels like we never left! Tonight was INSANE in all the best ways. I have a feeling the✨light✨hit everyone! #ThePrismaticWorldTour," she tweeted after her performance.

Gaga is set to perform tomorrow, May 10, at the Mohegan Sun Arena in Connecticut.

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