Fifth Harmony's Camila Cabello is the kind of friend you want in your corner!

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The Fifth Harmony member has been busy performing with her pal Shawn Mendes in recent days to promote their duet "I Know What You Did Last Summer," but she still has all the time in the world for one of her nearest and dearest friends.

The friend is Sandra Guzman, who Cabello calls "Pooi" and they are really close friends. They have epic sleepovers to prove it.

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Cabello revealed on Friday via Instagram that she "ran from the plane to celebrate Pooi's 19th birthday yesterday."

The 18-year-old girl group member shared an adorable snap with this longtime friend and others, noting, "She is the smiley one in the middle and we have been best friends since 3rd grade."

 ran from the plane to celebrate pooi's 19th birthday yesterday. she is the smiley one in the middle and we have been best friends since 3rd grade. there is nothing more important and more powerful than a friendship that stands the test of time, than love that adapts. Pooi, u have known me happy and in love and peeing myself (literally) of laughter and feeling on top of the world and u've known me anxious and distant and broken and u have been just as present and just as patient for both. for friends like you I can't thank God enough. i love you.

A photo posted by camila_cabello (@camila_cabello) on Jan 8, 2016 at 9:58pm PST

How cute, right?

"There is nothing more important and more powerful than a friendship that stands the test of time, than love that adapts," Cabello dished, adding, "Pooi, you have known me happy and in love and peeing myself (literally) of laughter and feeling on top of the world and you've known me anxious and distant and broken and you have been just as present and just as patient for both. For friends like you I can't thank God enough. I love you."

Guzman was just as thrilled to have Cabello by her side as she celebrated her final birthday as a teenager.

"Yesterday was my birthday and the fact that my best friend rushed from the airport to my house was probably the best gift anyone could've given me," she divulged.

The photograph is definitely very telling of their close bond; they're hugging and grinning so much!

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