So, Friends turned 25 last week (can you believe it?), and, naturally, people are quite keen to celebrate the anniversary. The 90s sitcom is widely believed to be one of the best sitcoms of all time, after all.

In fact, one of the twins who played baby Emma in Friends has shared a couple of unseen behind-the-scenes snaps of Jennifer Aniston (Rachel Greene), Courtney Cox (Monica Geller) and Lisa Kudrow (Phoebe Buffay) to mark show's 25th anniversary.

Jennifer Aniston reveals whether or not she would appear in a Friends reunion:

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Taking to Instagram, Cali Sheldon, who played the role alongside her sister Noelle between 2003 and 2004, posted the rare pics.

"The one where it all began.... #friends25," she wrote as a caption to one of the photos, alongside a love heart.

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The picture was taken during filming for the episode in which the characters celebrate baby Emma's first birthday party. It features Jennifer, who played Emma's mom, Courtney and Lisa.

The second photo shows Jennifer holding Emma while sitting in a grey armchair. Cali captioned the pic: "Mom (pt 2) #friends25," alongside a smiling heart emoji.

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And of course, the commenters had a lot say about the rare snaps:

"This is the cutest thing ever! I can't believe how adorable this is," wrote one fan.

"Oh wow, I feel so old. I can't believe how long ago this was. Damn," wrote another.

"Awww this was such a great episode. I absolutely adore the pic," wrote a third.

Even Ralph Lauren is celebrating the beloved NBC show's 25th birthday. Indeed, the label is now launching a collection inspired by Rachel Greene, who worked for the designer brand towards the end of the show.

"The collection is a celebration of the brand's role in the series," Ralph Lauren said in a statement, per CNN Style. "Just as Friends proved to be a perennial favorite series for viewers over the last 25 years, this collection reflects Ralph Lauren's timeless styles and archetypes that have remained a go-to for the modern working woman."

Twins who played Emma in 'Friends' share rare snaps for show's 25th anniversary