OK, he’s only 24, but Matt Leinart has a real job now — quarterback of the Arizona Cardinals. Which doesn’t mean he needs to take monastic vows … but at least should be smart enough to stop posing for photos when he’s having over the local chapter of the Tappa Kegga Bru sorority.

Here are four photos of Matt living large, with Nick Lachey.

It’s not the vaguely creepy Playboy Mansion feel to this that is a problem (doesn’t his spa look like it could be Hef’s infamous Grotto?) … it’s that he’s dumb enough to let it get on the internet. Like, what sort of judgment was going on when he mugged for the camera? He should be flipping off the guy taking snaps, not smiling at him.

I have a theory on Leinart. It’s your basic Nerdy Fat Kid Turns into Hunky Millionaire sorta thing.

Sure, he’s going to overcompensate, trying to tamp down the pain of being the chubby kid in elementary school. Acting out like this is understandable.

But then we have the concept of him probably approaching a full decade of out-of-the-cocoon reality for Mr. Heisman. Like, by the time he got to Mater Dei High School he probably wasn’t lonely for female companionship nor lacking for opportunities to get seriously hammered, bro, on someone else’s dime.

It’s time for him to be a bit more discreet, which is what Cardinals coach Ken Whisenhunt seems to be advocating in this story.

Time to say goodbye to the party-girl undergrads. Hanging out with 19-year-olds makes you seem like the creepy grad student who really should be giving this up.

And ban cameras, for goodness sake. I mean, you don’t really want to be famous in a Paris Hilton sort of way, do you Matt?

Or maybe you do. And that doesn’t seem compatible with success as an NFL quarterback. We don’t hear about Peyton Manning or Eli Manning partying down. OK, we get paparazzi photos of Tom Brady, but it’s usually him walking down the street with one woman (sted four) on his arm. Quite different.

Eventually, Leinart is going to need to be a leader of men. As opposed to a leader of frat boys. Or he will go down as an NFL bust, which doesn’t seem to have occurred to him yet.