The 50-year-old shared what appears to be a selfie of herself alongside her former co-stars Lisa Kudrow, Matthew Perry, Courteney Cox, Matt LeBlanc and David Schwimmer.
She captioned the photo: "And now we're Instagram FRIENDS too. HI INSTAGRAM."
And just like that, Jennifer Aniston went from having no Instagram presence whatsoever to having 151,000 followers, with the reunion picture garnering 865,000 likes.
It may seem like the actor is a little late to The Gram, but she previously said she had no interest in being on social media.
Explaining her reasoning a couple of years back on The Thrive Global Podcast with Arianna Huffington, she said: "For me, it's self-preservation. There's enough written about me out there and enough that's not true.
"There's one school of thought, which is, 'Why don't you be on social media and really show who you really are?' And I don't need to.
"This is the one place I have that's really protected and is mine and is what my life is without a camera rolling or paparazzi or media exposure.
"I don't feel I'm missing out, but I do sometimes feel that I'm not keeping up or that things are happening at a speed at which I'm going to be left behind in the dark ages.
"There's that curiosity that I have of, 'What is that? What's so funny? What's so interesting? What cute pet video is that?' So every once in a while I will Google someone's Instagram just to see something that caught someone's eye here or there."
Evidently now though Aniston has decided that if you can't beat 'em, you'd best join 'em.
But just because she's joined up, it doesn't mean she has to start 'gramming around the clock. Schwimmer, for example, has only ever posted twice: a throwback picture celebrating 25 years since Friends started and a video in which he attempted to exonerate himself from a beer theft in Blackpool. He has 1.6 million followers.
So remember Jen, it's all about quality over quantity. Although, to be honest, she's set a very high bar for herself with her first post.
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