We're told Dennis and his GF love the piece, but not everyone feels the same way ... some fans in the comments weren't exactly loving the new artwork, with one person writing, "You should have tried to talk him outta that my G."
Another person wrote ... "His girlfriend should have been against that. Shows her immaturity to NOT STOP him from doing this."
Though, it's a safe bet Dennis, who has a ton of tattoos and has never been shy when expressing himself, isn't losing sleep over a few negative Instagram comments.
There's just one thing ... now you have to stay together forever! 💖