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North West, Instagram Pic

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As North West's mom knows, a big sister can be a kid-of-any-age's best friend, an irreplaceable source of support, camaraderie, love and—if you care for her taste—clothes and style tips.

The firstborn daughter of Kim Kardashian and Kanye West became an older sibling Saturday, her baby brother making his debut a few weeks ahead of schedule. (Emulating his big sis already...)

With his arrival, 2 1/2-year-old North's life changed forever. Even if she doesn't quite know it yet, the pint-size fashionista just secured her first job and, while there's no set list of qualifications, it's a 24/7 gig. As an older sibling, she doesn't just have to learn how to share and be patient—she's a built-in role model!

But if anyone's going to be up to the task, it's North West, who knows firsthand how important family is.

She can also rest easy knowing that she's a member of an ever-growing group of young ladies born to famous parents who have been tasked with being an older sibling. Here's a sampling of the ranks of the famous big sister club:

The Baby Bunch: North's fellow tots, who know what it's like to be so close in age to their little siblings.

North West, Penelope Disick, Khloe Kardashian

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Penelope Disick Who better to commiserate, er, celebrate with than her bestie cousin?! Kourtney Kardashian's second child is big sis to baby brother Reign—who is, of course, first in line to become Kim's son's best friend.

Maxwell, Ace, Jessica Simpson Instagram

Instagram

Maxwell Johnson: Jessica Simpson's daughter could be little brother Ace's twin—they're both flaxen-haired angels after all—but she's got a year on him. And look, she's already teaching him a thing or two!

Stephen Curry, Instagram

Instagram

Riley Curry If North needs any advice on the pains of having to cede some of the spotlight, she can consult Golden State Warriors star Stephen Curry's eldest daughter—who can rest easy knowing she looks just as adorable cuddling with baby sis Ryan as she does dancing the nae nae with her pops. 

Jenna Bush Hager, Mila, Poppy

Instagram

Mila Hager: Jenna Bush-Hager's 2-year-old daughter is getting along famously so far with new sis Poppy Louise.

India Rose Hemsworth: Chris Hemsworth and Elsa Pataky's daughter had to practically grow up in one fell swoop when Mom gave birth to twin boys Tristan and Sasha, but thanks to lots of family time—including solo bonding sessions with her stunning mom and dad—India seems to be enjoying her time as boss of two little brothers.

Later, Tots: Some sisters have a lot on their plates, such as elementary school. So while they no longer have schedules that allow for them to watch over their baby siblings like a hawk, family time becomes all the more important.

Bath tub fun #sundayfunday #siblings #familytime ?? by daddy

A photo posted by Tiffani Thiessen (@tiffanithiessen) on

Harper Renn Smith: OK, she doesn't have to give him any hair-grooming tips yet, but Tiffani Thiessen's 5-year-old daughter has already become fast friends with baby brother Holt.

Milla Jovovich, Dashiel Jovovich, Ever Jovovich

Instagram

Ever Jovovich: Resident gorgeous! Milla Jovovich's baby daughter, Dashiel, and her older sis may end up best friends but they will always be rivals when it comes to who has the more intriguing name.

?????? picking pumpkins ?????? #funday #halloween #pumpkinpatch

A photo posted by @alessandraambrosio on

Anja Louise Ambrosio Mazur: A model family! Alessandra Ambrosio's mini-me 7-year-old daughter never has to battle 3-year-old brother Noah for the Most Adorable title. It's a tie.

Charlotte Grace Prinze: Sarah Michelle Gellar and Freddie Prinze Jr.'s 6-year-old daughter is the picture of poise—and brother Rocky certainly seems happy to be hanging out with her.

Senior Management: These big sisters may not have as much to do with their kid sisters and brothers as they once did—or will have in the future—because they're busy dealing with their own growing pains (and, in some cases, burgeoning acting careers) but that doesn't make them any less of an authority on the bonds of siblinghood.

#nationalsiblingsday tb

A photo posted by Ava Phillippe (@avaphillippe) on

Ava Phillippe: Reese Witherspoon and Ryan Phillippe's daughter may be 16 now, but she's still a doting big sis to Deacon and Tennessee—and just like a mom, she loves her throwback pics.

Lily-Rose Depp, Instagram

Instagram

Lily-Rose Depp: Johnny Depp and Vanessa Paradis ' daughter is becoming a celebrity in her own right, but surely she's always been a star in little brother Jack's eyes.

ESC, Gigi and Bella Towels

Gigi Hadid Not that 19-year-old Bella Hadid seems to need any help, but we bet she's usually glad to have 20-year-old Gigi running in the same modeling circles with her.

Welcome to the club, North!