Mark Wahlberg and Justin Bieber are good pals, but the Biebs may have pushed the boundaries of friendship a bit too far by sending the Ted 2 star a picture of himself wearing only underwear.

“[Bieber] sent me a note saying he was doing [the Calvin Klein ad] and I was like, “Oh, cool,'”; said Walhberg in an interview with E!’s Maria Menounos.

“And then he sent me a picture and I was like, “Dude, don’t send me a picture of you in your underwear.’ That’s crossing the line. I don’t need to see a picture of you in your underwear.’

“I’ll probably see it when I’m driving down the street, and I’ll still try to avoid it,”; he added, referring to Bieber’s Calvin Klein ad campaign.

And “Marky Mark”; knows of what he speaks, having been a Calvin Klein model himself back in the ’90s. So who’s the better underwear model? Tweet us your thoughts: