Kendall Jenner and Hailey Baldwin have revealed their matching heart tattoos - but they're not the first celebrities to get identical inkings...

Back in the day, if you wanted to show you were going to be best friends 4eva, you scrawled it on your pencil case, or maybe invested in a cute heart necklace split down the middle so you could each carry a half with you.

But nowadays the only way to proclaim your BFF status is to get matching tattoos – and that’s exactly what Kendall Jenner and Hailey Baldwin have done.

The pair revealed their matching heart-shaped inkings in a Snapchat picture shared by Hailey, captioned Hails n Kenny. Sweet!

But they’re not the first A-listers to get identical inkings – here’s seven sets of celebs to proclaim their love for one another with permanent body art. Check out the pictures above too!

Beyonce and Jay-Z

The musical super couple may have kept their relationship on the down low in the early days, but they couldn’t hide this very obvious testament of their love for one another: matching tattoos on their ring fingers.

Bey and Jay got VI – the Roman numerals for 4 – inked to celebrate the fact that they were both born on the 4th of the month (of September for Beyonce and December for Jay), and also that they were married on 4th April. Aww!

Ed Sheeran and Harry Styles

Neither One Direction star Harry or everyone’s favourite ginger Ed are strangers to the tattooist’s chair – between them they have a kabillion inkings (give or take). And there’s one similarity between their many tats: Harry has ‘Pingu’ on the underside of one arm, whilst Ed has a picture of the cute penguin on his bicep.

Rather than being a happy coincidence, Harry and Ed actually had their his ‘n’ his tats done together. In an interview with MTV about his weird and wonderful body art, Ed explained: ‘I got that [the penguin tattoo) with Harry Styles,’ adding it was, ‘Kinda like a bro tat.’

You guys!

Rihanna and Lily Allen

Whenever Rihanna is tired of hearing someone jabber on about how amazing she looks (yeah, we know it’s not something you’d really get sick of hearing, but go with us), she can simply raise her right index finger – where she has ‘Shhh…’ tattooed – to get them to put a sock in it.

And Lily Allen clearly liked the look of the distinctive inking, as she went right ahead and got one done herself in 2009! They say imitation is the most sincere form of flattery and all…

Katy Perry and Russell Brand

With an Indian wedding full of A-list guest, elephant rides and even a fortune-telling parrot, Katy and Russell’s relationship was the ultimate celebrity love story – until they split in 2012. Sad faces all round.

But long before divorce papers were on their mind, the couple got matching tattoos in the Indian language of Sanskrit, which translated to ‘go with the flow.’

Louis Tomlinson, Harry Styles, Liam Payne and Zayn Malik

One Direction boys Louis, Harry and Liam – along with their former bandmate Zayn – all have matching screw tattoos on their ankles (it’s small, we know, but trust us – it’s there!).

Which just leaves Niall Horan as the only member of 1D – past or present – not to get the inking. But it’s not that a case of being left out by the other lads – the Irish star just really hates the thought of being drawn on with a needle! We hear ya, Niall.

Cara Delevingne and Jourdan Dunn

When model mates Cara Delevingne and Jourdan Dunn ran into each other in New York one night, they did what any girl gang would do – grabbed a bite to eat and then got matching tattoos to mark the occasion. Any excuse, huh?

The beautiful couple got identical ‘DD’ inkings on their hips, which we assume stands for Delevingne and Dunn rather than their bra sizes – but who knows?

Cara Delevingne and Kelly Osbourne

Jourdan isn’t the only bessie she shares body art with – she also has a very similar tattoo to another of her gal pals, Kelly Osbourne.

Kel shared a snap of their heart finger tattoos on Instagram last year, writing: ‘So happy that my bubba @caradelevingne is in town even if it is just for a night!’

BFFs 4 EVA and all that.

MORE!

Where do the stars go on holiday? Find out with these (massively envy-inducing) Instagram snaps

SEE MORE CELEBRITY PICTURE GALLERIES HERE