Looks like Donnie Wahlberg's new girlfriend -- former Playboy Playmate Jenny McCarthy -- is rubbing off on him (so to speak). At least we assume that's why he's now posting naked selfies on Twitter.

Last week, the erstwhile New Kid on the Block tweeted the shot seen here, writing, "Pre show shower time!"

He's been linked to McCarthy for about a month, but in fairness, he really can't blame her for this recent bit of exhibitionism.

The singer, actor and producer -- who will be 44 later this month -- keeps himself in pretty good shape. And just to make sure you know that, he's always been more than willing to prove it by showing you.

Recent examples? On Aug. 2, he played peekaboo with his shirt, and on Aug. 5, he tweeted out this shot of himself channeling the Hulk on stage.

But since Donnie is the older brother of former Calvin Klein underwear model Mark Wahlberg (who will always be Marky Mark to us), maybe it just runs in the family.