Matthew McConaughey, Justin Bieber

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It's official: Matthew McConaughey has jumped on the Justin Bieber shirtless bandwagon.

And lucky for the Biebs, the sexy actor—who is no stranger to showing off his own abtastic bod—totally approves of the singer's shirtless style.

"Really? Well, he keeps doing it in airports right?" McConaughey told MTV News at the junket for Mud when asked about the flack the Biebs has been getting for his lack of clothing. (Side note: Way to keep up with pop culture, Matthew!) 

VIDEO: Matthew McConaughey hits the premiere for Mud

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But just because the Magic Mike star questioned exactly where the "Beauty and a Beat" singer's been stripping down, doesn't mean he thinks there's anything wrong with Justin's apparent loathing of clothing. 

"No, no, no, no, no... I'm not saying you've got to wear a shirt in an airport, especially, I think, he's flying private, he can wear whatever he wants," he explained before personally addressing Justin and laying down the shirtless law: "[It's] appropriate wherever you say it's appropriate. It's your shirt."

And there you have it (sorry, Olivia Wilde). 

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