She's as honest as the day is long, and you need her by your side when you've got lipstick on your teeth.

Getty/Mirrorpix

She's as honest as the day is long, and you need her by your side when you've got lipstick on your teeth.

What would you do without her—that Southern sister who loves you enough to give it to you straight? She's always got your back, especially if your slip's hanging out. She gives boyfriend advice, beauty advice, hair advice—and most important of all, honest advice every single time. She will not let you walk out of Belk's with a cocktail dress you can zip but can't sit down in.

Your best girlfriend is your rock, the voice you can always trust. We wondered—what are the things that she and ONLY she is brave enough to tell you when nobody else will? Let us know what you think. Here's what the Facebook Brain Trust had to say:

RE: PERSONAL GROOMING

“There’s something stuck in your teeth. I hope you haven't been smiling at everybody.”

“You’ve got just a touch of salad dressing on your mouth. I doubt anybody noticed it but me.”

“There’s some toilet paper on your shoe. How long have you been walking around like that?”

“Honey, you need a mint.”

“You’ve got lipstick on your teeth. Here, let me show you a little trick for making sure that never happens again.”

“Go like this.” [Followed by hand gestures indicating what needs to be wiped off of where.]

RE: MERCH QUALITY

“He gave you those pearls for your birthday? Did you rub them against your teeth to make sure they’re real?”

“What a cute purse from Target! Did you smell it to make sure it’s real leather?”

RE: PERSONAL VALUES & MENTAL ACUITY

“HAVE YOU LOST YOUR MIND??!!!”

 “Your mama taught you better than that.”

"Honey, you're not crazy. You've just got fuzzy brain."

RE: RELATIONSHIPS

 “He’s not worth it.”

"I'd let him know right quick he's not the only fish in the sea."

"Now, that one's a keeper."

"Girl, I'm worried you just drove your ducks to a bad pond o' water."

RE: STYLE

“Your tag’s showing.”

“Honey, your shirt’s on wrong side out.”

“That makes your fanny look big.”

“That bathing suit's awful on you. Take. It. Off! You’ll thank me when you get to the beach.”

“Just because you can squeeze into it, that doesn’t mean it fits.”

“Uhhh, it’s a little tight right there." [Followed by a pat on the backside.]

“There is no shame in needing alterations.”

“Don’t feel bad. We all reach a point where we can’t pull off a mini.”

“You better watch it or you’re gonna get fat again.”

“I hate to tell you, but that sales lady lied.”

RE: BEAUTY

“Girl . . . you need a good haircut!!”

“Your hair looks a hundred percent better.”

 “You look tired. Are you out of blush?”

“Sweetie, I think your roots might need a touch-up.”

 “You’ve got a makeup line. Come over here in the light and let me blend you a little.”

WATCH: "Julia Sugarbaker's Best Takedowns On Designing Women"

Is there any doubt in our minds that Julia would tell Suzanne she might want to rethink that heinous swimsuit she just tried on? Why no. There is no doubt whatsoever.