Fifty-one is the new twenty... if you're Jennifer Aniston, that is.

The star has proved you can look better than ever at fifty-one as she showed off her toned physique on Instagram this week following her birthday photoshoot.

Fans have been praising the actress and truly can't get enough of her latest snaps - even Courteney Cox couldn't help but fangirl. Keep scrolling to take a look.

We were first introduced to the Friends gang in 1994.

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Ross (David Schwimmer), Rachel (Jennifer Aniston), Chandler (Matthew Perry), Monica, (Courteney Cox), Phoebe (Lisa Kudrow), and Joey (Matt LeBlanc) burst onto our screens in September 1994. Created by David Crane and Marta Kauffman, the comedy follows the friends, who live in the same New York apartment block, as they navigate their lives.

The sitcom became an instant hit.

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The show propelled each cast member into superstardom, with the show winning several Emmy's during its ten-season run. The success of the show can't be denied...even the theme song, "I'll Be There for You," during the iconic title sequence is impossible to not sing along to. Allegedly, the cast was also each on an eye-watering $1 million salary per episode in the later seasons of the show - a history-breaking figure.

Over the years, there have been a few low-key reunions and a lot of false hope...

Apart from the occasional reunion on talk-shows, fans have had their fair share of disappointments when it comes to waiting for a Friends reunion. A fake trailer for a Friends movie trailer even went viral last year, giving superfans false hope that the sitcom was hitting the box office.

In 2018, Matt Leblanc said a Friends reunion would never go ahead.

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The actor left fans heartbroken as he rejected calls for the show to return, saying the sitcom simply "wouldn't be the same" in an interview with the Mail Online. He added: "People want to know what happened to them. But it was about a finite period in a person’s life after college, before you settle down and start a family."

Lisa Kudrow also dismissed talks of a reunion...

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While appearing on Late Night with Conan O'Brien, the actress said: "They're rebooting everything. I don't know how that works with Friends, though. That was about people in their twenties, thirties. The show isn't about people in their forties, fifties. And if we have the same problems, that's just sad."

It's not just the cast that has shut down calls for the sitcom to return...

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The show's creator Marta Kauffman, says she constantly gets "nagged" by fans to bring the sitcom back.

"Watch the old ones – there is no way we could win that. And there's no way it would be satisfying and it'll never happen. We'll never do it," she said.

At this point, it was pretty clear that a Friends reunion was never going to happen.

But, as we were finally beginning to accept we wouldn't see the gang on our TV's again, Jennifer Aniston only went and totally changed the game...

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Speaking on The Ellen DeGeneres Show last year, the actress gave fans a fresh glimmer of hope...

Speaking to Ellen, the star said the cast are all on board for a reunion.

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Yes, you read that correctly... When asked the usual question about a potential reunion with her fellow co-stars, Aniston surprised fans, saying: "Why not? You know what, because, listen, I told you this.

"I would do it... The girls would do it. And the boys would do it, I'm sure. Listen. Anything could happen."

The actress seemed very keen to get together with her former castmates...

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Aniston joked that she could do a revival by herself if nobody else was up for it.

But there's one thing that Jen previously never joined in with her fellow castmates...

And that's an Instagram account.

All other castmates are pretty active on their social media accounts...

Lisa Kudrow, Courtney Cox, David Schwimmer, and Matt Le Blanc post regularly on their Instagram accounts - it's only been Jennifer and Matthew Perry who have kept their distance from the social media platform.

But last year...

Jennifer finally created an Instagram account! She created her account under the name @jenniferaniston on the 15th of October, and her first post was everything we could have dreamed of.

Jen wasted no time in giving us fans what we want...

She shared a selfie of herself and the rest of the Friends gang, clearing enjoying an evening together. "And now we’re Instagram FRIENDS too. HI INSTAGRAM," she captioned the post.

A whole host of celebrities were excited by Jen's debut pic.

Friends co-star Lisa Kudrow had this simple response.

David claimed that he was actually there.

Yeah, of course you were David!

But fans have noticed something pretty funny.

Like all of us on Netflix, Jen immediately got herself into a slightly awkward encounter with an ex. Just when you thought you couldn't love her more!

No, not Brad.

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We're talking about Justin Trudeau. The pair split in 2017 - but they've managed to maintain a strong friendship since their split. More power to them.

And eagle-eyed fans noticed something on Jen's Insta immediately.

Firstly - Jen followed Justin. And secondly - Justin commented on Jen's first post! What does it all mean? (Probably nothing. But still!)

Things eventually calmed down after Jen's first post...

But she has been pretty consistent with her posting, and us fans have been in for a real treat with lots of wholesome Jennifer content.

She has also posted plenty of throw-backs...

Because we all love the 1980s Rachel Green!

But the most recent post was a stunning one...

Just when we thought we couldn't love her any more...

Jen turned the big 5-1 on February 11th.

And she well and truly celebrated in style.

Of course, Courteney Cox chimed in on the celebrations...

The Monica to Jen’s Rachel knew an online acknowledgment was needed – and the one she went for was totally incredible!

Cox actually dressed up as her pal.

“No matter how hard you might try… there’s only one Jennifer Aniston. Happy birthday my dear friend."

But the best part of Jen's birthday was the surprise photoshoot she had with Interview Magazine.

And she uploaded a series of 3 pics from the shoot.

She's looking better than ever.

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"Thank you @interviewmag for this birthday surprise. I had no idea this would be coming out today. Feeling proud and honored to be celebrating with this cover. Thanks to the Interview team for celebrating women at every age... turns out 51 is pretty fun," she wrote.

But there's one pic, in particular, that got everyone talking.

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Because her physique looks so damn good! Keep scrolling to take a look for yourself.

In fact, her comments were flooded with compliments.

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A whole host of famous faces took to Instagram to gush over the actress.

Even Courteney Cox couldn't help but fangirl over her bestie...

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We can't get enough of their friendship.

Here's the photo in question:

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If we look half as good as this when we're fifty-one we'd certainly be happy. Want to read more on our favorite Friends star? Jen recently spoke out about the rumors that she and ex-beau, Brad Pitt were dating again. Keeps scrolling to see what she said...