Justin Theroux joined Instagram [1] this week and is already proving that he knows exactly what he's doing when it comes to social media. The sexy actor [2] posted a throwback photo of himself as a teenager on Dec. 3, captioned, "#TBT SIXTEEN." In the snapshot, Justin is seen rocking his signature earrings and long sideburns while wearing a dark jacket and staring off into the distance. Jennifer Aniston's husband [3] also posted a black-and-white selfie earlier this week as his first Instagram photo. See the throwback below, and then check out all the celebrities you should be following on Instagram [4].
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