Zac Efron's former flame, Vanessa Hudgens, is no stranger to wardrobe malfunctions. A few weeks ago, during an appearance on Jimmy Kimmel, the starlet set tongues wagging in a super low-cut orange jumpsuit that she was thisclose to spilling out of. And now she's at it again. Only this time the low-cutness of it all is at the front of her pants.

Kids these days. Who knew there was such a thing as crotch cleavage?

Check out Vanessa's crazy wardrobe malfunction:

When celebrities get invited to the White House Correspondents' Dinner, they generally keep it classy -- i.e., not too much cleavage. Muted makeup. Long hemlines. Sleeves.

For the occasion, the infamously edgy Katy Perry left her American flag bustier and cat ears at home and went with a demure strapless Giambattista Valli gown with branch detailing at the waist. Her ebony hair was side parted in cascading waves. Her arms looked Michelle-Obama caliber AMAZING. (Take that, John Mayer.)

This playing-by-the-fashion-rules vibe made her almost unrecognizable, in fact. Has Katy ever met an event she didn't try to upend in some cheeky way? This is the same girl who made blue hair chic and who can pull off a bra made of film canisters. 

But look closely at a head-to-toe photo like this one of Katy Perry at the White House and you'll see that her inner rebel was in fact in attendance.

Rosie Huntington-Whiteley must have heard about the scientist who declared bras to be bad for your boobs! The Victoria's Secret model was snapped sporting a very revealing, sleeveless top and most definitely NO Wonder Bra. The question is: did she look in the mirror before heading out on the street?

Apparently Rosie was leaving a swanky Beverly Hills hair salon when the shots were snapped. Her hair does look awesome, as per usual, but perhaps it was a bit, er, NIPpy in Southern California the other day? The Daily Mail sagely notes that it's not as if she needs a bra. Indeed, but more to the point, after carefully scrutinizing all of the shots of Rosie in her perky glory, I have come to the conclusion that ...

Joke all you want about stereotypical soccer mom style or lack thereof -- "mom jeans," bulky hooded sweatshirts, maybe even some high-top sneakers -- but certain celebrity mamas have really been pushing the envelope in terms of what's acceptable on the sidelines.

Britney Spears accidentally bared her butt when a gust of wind lifted the skimpy white shirt dress she wore to her sons' soccer game last week. This week, controversial country singer LeAnn Rimes chose a pair of shiny black Daisy Dukes and some high-heeled ankle booties for her stepson's little league game. What's up with stars dressing inappropriately for their kids' athletic events lately?

Another day, another celebrity private part hanging out. Not much to see here, guys. Keep it moving. Unless, you know, you like celebrity bits 'n' pieces. Then by all means, keep reading! This time, it's Nicki Minaj and her boobs. While shooting a video in an incredibly low-cut bathing suit, Minaj's breasts, unsurprisingly, decided to pop out and say hello. And, you know, the whole "accident" managed to make its way into a behind-the-scenes video, so yeah. Don't think Nickers cares all that much. 

Check it out:

Sky diver Inmate Actress Vanessa Hudgens made an appearance on Jimmy Kimmel recently to promote her new film Spring Breakers, and boob alert! The star was precariously close to a wardrobe malfunction! The strapless orange jumpsuit VHudg wore showed a lot of cleavage, and, well, there are some pretty risque photos of her on the Intrawebs right now. A word of advice: When you're lucky enough to be so well-endowed, Vanessa, you may want to consider wearing something a little less low cut. Up to you.

But, see, that's not the biggest problem with this outfit.

Britney Spears showed up for sons Jayden and Sean's soccer games over the weekend. She remembered to bring water ... but she forgot her pants! She showed up in some long, flowy white t-shirt thing and a pair of Uggs, and a lilting breeze took up her skirt and flashed her bare bottom for all the little soccer players to see. One particularly bad photo shows both butt cheeks exposed right in front of her sons. And that makes her this week's Most! Embarrassing! Mom!

Poor Britney, always leaving BEHIND something important. I can relate. I've left my home without my keys, my wallet, my phone. Happens to busy moms all the time. But I can say with 100 percent certainty, I have never left home without my pants. Thankfully, Britney eventually realized she was missing something very important.

Sometimes they just want to pop out for a quick hello, you know? Mariah Carey was presenting long-time collaborator Jermaine Dupri with a birthday cake at So So Def's 20th anniversary concert in Atlanta on Sunday, and for a brief moment, Mimi's boob popped out. The mom of 22-month-old twins Moroccan and Monroe was wearing a strapless cream dress with metallic studs that, evidently, didn't provide the support she needed. But hey, if I had to guess, Mariah Carey's nip slip was probably a highlight of the party. Peek-a-boo! I see you!