Dennis Rodman Gets Huge Portrait Tattoo Of GF On His Face

Dennis Rodman took the saying "tattoo my name so I know it's real" to the extreme ... getting a portrait of his girlfriend's face inked on his cheek!!

The NBA legend hit up 'Black Ink Crew's Van Johnson on Thursday, getting tattooed at the artist's home. Dennis shared video of the new tattoo on social media.

As for anyone who thinks the ink is fake, Johnson tells TMZ Sports it's "really real," saying the job took a little over an hour to finish.

"He was a champ, he sat through it," Johnson says. "Pretty random, but he love the hell out that girl."

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.