Katy Perry kicked off her Prismatic Tour in Belfast yesterday. Thanks to its use of colorful costumes and over-the-top props, it caught everyone’s attention. However, one famous person noticed something that rubbed her the wrong way.

That famous person was Lady Gaga.

But first, let’s look at Katy’s tour!

Lots of STUFF to look at, right?

Your eyes literally don’t know where to rest because of all the visual assault.

Thankfully, Gaga wants to direct us to one part in particular. She tweeted this not-so-cryptic message.

Please note the “shade-y” eye emoji.

Mechanical horses? She can only be referring to this moment…

And of course, there’s the green hair.

On Gaga’s Born This Way tour, she also rode on a horse…

And of course, there’s the green hair.

It’s just an observation on her part, but should she really be taking it this…personally? After all, she’s been accused of copying Madonna’s act since she started.

Not to mention Bette Midler’s famous mermaid-in-a-wheelchair bit.

Pot calling the kettle black?

Or calling it very, piping hot black?

We can practically see the steam.