▲A reporter said the singer's smell reminded her of a 12-year-old girl’s bedroom. But it gets weirder—according to Aguilera's childhood friends, she smells like hot dogs!

▲Depp reportedly goes days without showering or washing his hair.

▲Fox confessed she often forgets to flush the toilet, even after going number two! She also said in an interview that her wardrobe on 'Transformers' always smelled like farts.

▲DiCaprio likes to do his part for the environment. Apparently he doesn't like to waste water showering, so he only does so once or twice a week. He also ditched the deodorant.

▲According to her former roommate, the actress used to wax her bikini line on the couch and stuff her bra with chicken cutlets before auditions. In addition, both Alec Baldwin and Jason Bateman have said that she has bad coffee breath.

▲The singer once took her shoes off during a flight, and so many passengers complained of the smell that a flight attendant had to ask her to put her shoes back on. She also reportedly eats meals in bed and doesn't wear deodorant.

▲Another A-lister who doesn't wear deodorant. And if that wasn't enough, her former bodyguard claims she'd go days without having a shower.

▲Reportedly the singer once wore someone else's retainer. What's next, sharing toothbrushes?

▲The actor told Esquire Magazine that he doesn't use deodorant.

▲The Hollywood star reportedly wears the same clothes for a number of days in a row. And she doesn't wear deodorant, so you can imagine how that goes.

▲Ke$ha said in an interview that she smells like a hobo and that she's been told she smells bad on several occasions. Once someone told her she smelled like a shrimp on a diaper. She is also known for drinking her own urine.

▲When he's not (infrequently) showering with a lemon and apple cider vinegar mixture, he simply uses baby wipes. Oh, and no deodorant, like many other stars on this list.

▲The actor prefers baby wipes to showers. Even after working out!

▲Courteney Cox’s ex-husband David Arquette once said that she may be pretty, but if she's not on top of it, she smells like a truck driver—and he liked it!

▲The Hollywood star hasn't used a deodorant in over 20 years. McConaughey said he doesn't like to smell like something or someone else.

▲Cooper doesn't wash his jeans regularly. He admitted on his own show that he had done it about twice in six months. But it gets even grosser: he reportedly wears the same jeans every day!

▲Gwyneth Paltrow also doesn't wear deodorant. She believes it's a harmful product as it contains aluminium and can give you cancer.

▲Kourtney Kardashian stopped wearing deodorant while breastfeeding. Khloe and Scott Disick eventually told her how bad she smelled in a 'Kourtney and Kim take Miami' episode.

▲According to his friends, Crowe's foul smell is mostly due to his taste for curry and alcohol.

▲Alicia Silverstone shared a video of her feeding her baby with her own mouth. Yes, just like birds do. She's also not fond of deodorant and has reportedly distracted students in a yoga class with her body odor.

▲The singer confessed on TV that she only brushes her teeth about three times a week. The reason? Because her teeth are very white and because she doesn't like how slippery her teeth feel like when she brushes them.

▲The 'Twilight' star allegedly has a pungent odor. Apparently, she doesn't shower regularly, wash her hair, brush her teeth, or wear perfume.

▲The actor reportedly doesn't like to shower, or wash his hair. He said he only showers when he can't stand the air around him. Reportedly, the 'Twilight' cast and crew suffered a lot with his smell.

▲The actor didn't shower for weeks while filming 'Fury.' Apparently it helped him get into character. The cast and film crew didn't think it was a good decision.

▲Another actor who went a bit too far to get into his character. He went into the woods and didn't shower for days while filming 'Lord of the Rings.'

▲Reportedly, Orlando Bloom's poor personal hygiene contributed to his breakup with Miranda Kerr. Apparently he wore clothes for a week without washing them, showered rather infrequently, and slept with his dog.

▲Snooki apparently rubs cat litter on her face to clean it. She has also confessed that she has bad breath.

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The actress reportedly only washes her hair once a month. She's also known to walk barefoot in many places.

Check out some other bizarre celebrity habits.

▲Ellen DeGeneres asked the star to weigh in on the viral Twitter poll asking whether people wash their legs. Swift replied, "I do, 'cause when you shave your legs … the shaving cream is like soap, right?” Wrong! She also appalled fans by admitting to shaving every day.

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When we see celebrities on the red carpet looking flawless, it's hard to imagine that some of them have poor personal hygiene. But behind the scenes, many of these stars are not as perfect as they might seem. Take Taylor Swift, the world-famous singer who revealed she has a very questionable shower routine.

Click through the gallery and get to know which stars are the most stinky.