Newlyweds Cameron Diaz and Benji Madden did date night, and flaunted a new art piece ... on his cabeza.
Madden and Diaz hit up The Nice Guy in West Hollywood Saturday night, and it looks like Benji's tattoo artist has been busy ... based on the complex design now blanketing his head.
Madden went much simpler when it came to honoring his wife with some ink on his chest.
It's just a matter of time before there's a portrait of Cameron somewhere on his bod, right? Not that we recommend that kinda thing.