1. They always have that thing that you need when you need it. Like Chapstick. Or a Tampon.
2. They're always willing to try something new with you. Like trapeze artistry at that new place by the pier, or whatever. Because looking like a big idiot doesn't stop your girlfriends from doing anything with you.
3. They'll bring you little presents just because. If your girlfriend saw a pen with cat ears on it and thought of you, you bet your shit she bought it for you and gave it to you at brunch.
4. They'll keep your secrets when you need them to, but will also tactfully spread the word for you about breakups so you don't have to. Men only communicate via grunting, as we all know, which makes them ineffective transmitters of news about anything at all.
5. You can talk about cramps and they get it. And will not mock you for it when you do not have cramps.
6. You can text entirely in emojis and they understand it all. A man using emojis is like a fish trying to use a pen. It's just impossible.
7. Their emoji-less texts are thorough. No one-sentence answers here! Girls text like they're writing books and it is GREAT.
8. You can be a total mess in front of them and they'll never judge you. Like that time you nonchalantly threw up on yourself in the back of a cab all over your fur vest with your crush sitting to your left and your BFF to your right, and she then helped you clean it up so said crush didn't notice. (Sidenote: he would also have to be as intoxicated to not notice, but whatever — your bestie is, well, the best.)
9. They have their shit together when you do not. It's a law of girlfriendship that when you're a mess, she is fine and ready to take care of you; when she is a mess, you are fine and ready to take care of her.
10. They know how to make a plan when it comes to ladies' night. Guys, take notes because it drives girls UP THE WALL when you can't decide on a time or place to meet up. (If there was an emoji of a girl pulling her hair out, I'd insert it here.)
11. They're always down for a boozy brunch. Grapefruit ginger mimosas all around!
12. They love to go out and dance — and actually know how to do it. And they wear sparkly get-ups, so you're not the only fool fist-pumping in a sequin minidress.
13. They dress impeccably. Let's be honest, your favorite clothes porn is whatever your best friend has on. #OOTD
14. They take the best pictures with your smartphone. And they know that you need to tap the screen to make the camera focus first.
15. You don't have to think twice when you respond to their texts. Because they're not judging you (see no. 8) — or trying to date you, so you can just be you.
16. They text you back right away. Unlike men who see multiples movies (or ACT like they're seeing multiple movies) before texting you back.
17. They rarely ever bail on plans. Because it's just not in their DNA.
20. You can watch a tear-jerker kind of movie and don't have to worry about silent crying the entire time. Because chances are your BFF is crying just as hard as you are.
21. They remember when you have an important meeting and call to give you a you-can-do-it pep talk beforehand. They also can't wait to hear how it went immediately after.
22. They'll give you the same endless advice about guys, work, etc., until you don't need their advice anymore about said issue. And they'll do it with a smile on their face no matter how many times you make the same mistakes.
23. They know exactly what to get you for your birthday without you having to leave hints (i.e. magazine clippings) around the house/apartment. You: "OMG, you got me a Paris necklace?!!! I love Paris." Her: "I know."
24. If you breakup with your real boyfriend, they don't ask questions and are at your place in seconds with wine, tissues, and Ben and Jerry's on hand ready to listen to every single detail. They already know your favorite wine and B&J flavor (Half Baked Frozen Yogurt). Oh, and that you like Puff's tissues with lotion because they don't make your nose red.
25. They're genuinely happy for you when you do finally find a significant other. Because even if they haven't found the man of their dreams yet, seeing you happy will not only make them happy, it will give them hope.
26. They don't make you watch sports. Instead, they make you watch shows you haven't had time to watch yet. You then become totally addicted to said show because your BFF has the same taste in life as you.
27. You can totally call them at 7:45 a.m. just to talk about whatever happened last night. And they pick up because they truly give a shit.
28. They like kale just as much as you. It's the new spinach, and if you can't get behind that then you can't sit with us.
Follow Carly on Twitter.
Related:
40 Signs You've Been BFFs Forever
14 Ridiculous Conversations All Female Friends Have Had
20 Things Women Absolutely Cannot Do Without Each Other
Photo Credit: Getty
With all of the pretty being celebrated on National Girlfriends Day, it made us think about the beauty products that go together like Cher and Dionne or Carrie and Samantha to create the gorgeous looks we wear 24/7. Behold the makeup BFFs.Going for a red lip? Its no-brainer beauty partner in crime is a black liquid liner. Whether you go for a thick or thin line that's winged or just simply lines your eye, this pairing is a must for date night. Try Nars Lipstick in Fire Down Below, $26, sephora.com and Guerlain Liquid Liner, $37, sephora.com.
if(typeof pageAds!="undefined"){document.write(pageAds.ams_cosmo_top);}else{var int=window.setInterval(function(){if(typeof pageAds!="undefined"){document.write(pageAds.ams_cosmo_top);int=window.clearInterval(int);}},50);}
Homepage / Celebs & Style / Conversation Starters /Leonardo DiCaprio Syndrome: Celebrity Guys and Their Baby Model Girlfriends if(typeof pageAds!="undefined"){document.write(pageAds.ams_cosmo_sponlogo);}else{var int=window.setInterval(function(){if(typeof pageAds!="undefined"){document.write(pageAds.ams_cosmo_sponlogo);int=window.clearInterval(int);}},50);} Leonardo DiCaprio Syndrome: Celebrity Guys and Their Baby Model Girlfriends As Cher Horowitz would say with an eye-roll, "Older guys like younger women. Film at 11."By Anna Breslaw 
Korin Miller
Michelle Ruiz
Dara Adeeyo
Elisa Benson