Justin Theroux is officially an Instagram user!

Jennifer Aniston's handsome, 44-year-old hubby joined the photo-sharing site on Tuesday, Dec. 2 — and has already shared his first selfie!

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"#on," Justin captioned the black and white snapshot of himself posing in front of a mountainous landscape. The best part? Just hours after the actor created his account, he has already amassed more than 10,000 followers!

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So does this mean Justin's wife, Jennifer, 46, will join Instagram next? It's unfortunately unlikely. In a previous interview, the former Friends star admitted social media really stresses her out! "[I was] sweating bullets," she told People of a past online experience. "It was too much pressure."