Brad Pitt is trying to catch up with his wife when it comes to tattoos!

The actor was spotted out in Los Angeles this week sporting some brand new ink on his forearm -- and it's definitely got something to do with his large, blended family.

The piece features a two-column chart, one side with the letter "A" at the top and the other with the letters "M," "P" and "Z." While he hasn't spoken out about the tattoo yet, many are speculating that the "A" is for Angelina, while the three other letters represent Maddox, Pax and Zahara.

It's clear there are additional letters after the "Z," so we can only assume Shiloh, Knox and Vivienne have some representation on there as well.

Pitt is no stranger to tattoos. He has one in honor of the largest sequoia, another of Angelina's birthday on his hip and a poem from Jalal ad-Din Rumi on his arm reading "There exists a field, beyond all notions of right and wrong. I will meet you there."

He also has an outline of Otzi the Iceman on his arm and some drawings on his back that Jolie drew on him one night in Davos, Switzerland.

"He just liked it! The picture everybody saw was kind of awkward, but it just lines up beautifully on his back, just enhances the part of the body I like," Jolie revealed back in 2008.

Jolie herself is also known for her ink, including the coordinates of Pitt and their children's birthplaces.

What do you think of the new tattoo? See more inked up stars in the gallery above!