Celeb confessions that made us totally uncomfortable

Who soiled their pants? Who vomited on stage? And who had to have simulated sex in front of their mother? From Martha Stewart's crazy sex life to Megan Fox's poor bathroom habits, the following celebs have unburdened their souls and confessed to some hilarious and hellacious behind-the-scenes secrets.

Zac Efron's condom mishap

Zac Efron might have stolen your High School Musical-loving hearts, but he proved himself the worst nightmare of every high school girl's father when a condom fell out of his pocket on a red carpet in 2012. Efron's reaction skills were on point. He quickly retrieved the rubber and hid it behind a wry smile and a closed fist. What makes this more embarrassing is that the prophylactic popped out at a movie premiere for The Lorax—a kids' flick.

After the initial shock died down, Efron appeared on the Today show and when prompted to discuss the snafu, he said, "[I] never really had a pocket-checking policy when I was going on the red carpet before, but now we've fully instated one." He added that it's "better to be safe than sorry," quipping that the message was "a great [one] to add to the many messages in the film."

Justin Bieber vomits on stage

Pop star Justin Bieber blew chunks on stage on opening night of his 2012 world tour. Video of the vomiting was regurgitated online, showing Bieber stumbling off stage, but eventually returning to thank his fans for the support. "It's not really a great feeling when you're throwing up in front of a bunch of people," he told the crowd, "but I know that you guys don't judge me do you?"

"No!" the crowd erupted.

"You love me just the same?"

"Yes!" the audience screamed.

The love fest went on and on.

Bieber later addressed the incident on Twitter, quoting Anchorman: "…milk was a bad choice."

James Franco admitted he tried to hook up with an underage fan

Yeah, that seems to be the appropriate facial expression over this sketchy story. In 2014, James Franco admitted that he tried to hook up with an underage fan who saw his Broadway performance in Of Mice and Men. According to the Daily Mail, a 17-year-old Scottish student shared a photo on Instagram that prompted a "flirty" exchange of messages with Franco, who reportedly asked her if she had a boyfriend and if he should "rent a room." Franco claimed he didn't know the girl was under age 18, yet he still felt the need to clear the air, which was tainted by the stench of social media scandal.

In an appearance on Live with Kelly and Michael, Franco said, "I'm embarrassed, and I guess I'm just a model of how social media is tricky," he said. "It's a way people meet each other today, but what I've learned…you don't know who's on the other end." Franco confessed, "[I used] bad judgment, and I learned my lesson, but unfortunately, in my position…not only do I have to go through the embarrassing kind of rituals of meeting someone, sometimes if I do that then it gets published for the world, so now it's like doubly embarrassing."

If nothing else, the A-list actor surely gained some valuable experience about online dating etiquette: vet before you're set.

Fergie's urine misadventure

In what "London Bridge" singer Fergie—real name Stacy Ferguson—considers "the most unattractive moment of [her] life," she wet her pants while performing on stage in 2005. Fergie told Hot 97 radio that it wasn't a common occurrence for her to have this kind of accident while performing. "This does not just happen all the time," she said, explaining that she was stuck in traffic and late for the show, so when she arrived, she hustled on stage to perform "Let's Get it Started." "I get crazy and I jump and I run across the stage and my adrenaline was running," she recalled, and then, suddenly, something else was running, too. "I wish it didn't happen," she lamented. "It was so embarrassing."

To be fair, she's not the only celebrity who's had an accident while performing. Others in this bladderlicious (and bowelicious) club include Chris Brown, Hugh Jackman, Marie Osmond, and Patti LaBelle.

Rumer Willis admits to crushing on ex-stepdad Ashton Kutcher

Is there anything weirder than your mom marrying your celebrity crush? Rumer Willis, whose father is actor Bruce Willis, was reportedly mortified when her mother, actress Demi Moore, started dating That '70s Show star Ashton Kutcher. Moore was 41 at the time; Kutcher was 25. The unconventional couple wed in 2005 and divorced in 2013.

Years after their split, Willis opened up about the moment she found out her mom was hooking up with her crush. "That's when you open your Teen Beat and just take him down, rip out somebody else, and put them up," she told Howard Stern (via E! Online). Willis added that she gave her mom credit. "I was kind of impressed like, 'Yeah girl, get it,'" Despite the initial awkwardness, Willis told Stern (via the Daily Mail) that Kutcher was "a really great step-father."

Megan Fox's unsanitary habits

When folks think of Megan Fox, they often think sex pot, but maybe Porta-Potty would be a more accurate association. In a 2008 interview with GQ (via The Huffington Post), the actress revealed her less-than-savory hygiene habits. "I'm horrible to live with. I don't clean," she said. "I forget to flush the toilet. Friends will tell me, 'You totally pinched a loaf in my toilet and didn't flush.'"

The Transformers siren may not be terribly embarrassed by that, but we're kind of humiliated on her behalf.

Martha Stewart's surprisingly racy sex life

She's a lady in the streets, but when Martha Stewart gave a no-holds-barred interview with Andy Cohen of Watch What Happens Live in 2013, she revealed that she may be a freak in the sheets. When asked if she'd ever had a one-night stand, Stewart coyly answered, "Yes," but declined to dish details. When pressed about her sex life, she also admitted to sexting, and though she said she had never hooked up with another woman, she played it pretty close to the pocket when Cohen asked if she'd ever engaged in group sex. "Maybe," she smirked.

TMI, Stewart! TMI!

Jessica Simpson shocks her dentist

Singer and fashion designer Jessica Simpson shocked her fans when, during a 2010 interview with Ellen DeGeneres, she said she often skips the tooth-brushing part of oral care and goes directly for the mouthwash. "I don't brush them everyday," she said. "I'll use a shirt or something. I know it's gross, but I always have fresh breath."

Simpson defended her regimen. "My teeth are so white and I don't like them to feel too slippery, but I do use Listerine and I do floss every day," she said. "Find me when I'm 60," she laughed, "and [my teeth] will probably be all out, but I literally have these strong powerful teeth that don't need to be brushed."

Simpson's dentist later weighed in, telling People magazine, "I was kind of shocked. I assumed everybody brushed their teeth all the time. People pay us a lot of money for that slippery feeling. It's kind of the best part." He added, "It's great that she's flossing all the time, but you have to brush too. What goes on in your mouth really affects your whole body."

By the way, the American Dental Association (ADA) recommends brushing twice daily and replacing one's toothbrush every three to four months or sooner, depending on the bristles' wear

Jenny McCarthy's epic walk of shame

The Huffington Post published a rather embarrassing account of Jenny McCarthy's pre-Playboy sex life. "I was in college and I just broke up with my high school sweetheart of, like, seven years, so I hadn't been with anyone except him. So, I met this boy in college and we saw each other a few times and then we went back to his place and did it," she recalled.

"And right afterwards he said to me, 'Are you hungry?' And I said 'Yeah!' and he's, like, 'McDonald's is right across the street, what do you want?' And I'm like, 'I want a Big Mac, extra sauce, no pickles!' And he's like 'OK' and he got up and left…and never came back. And I was in his apartment!"

And I wait, like hungry," she said, "for four hours and I look out the window and I'm like, 'McDonalds is closed!' and I realized, Oh my God, he left me. So I had to do the walk of shame back to my college apartment. That was, like, the worst experience."

McCarthy obviously recovered and forged a booming career rooted in talking about sex. We can't help but wonder what that college guy is up to now.

Christopher Mintz-Plasse does it in front of his mom

In a 2009 interview with The Guardian, Superbad star Christopher Mintz-Plasse admitted to something horrific. When asked about his sex scene in the hit flick, Mintz-Plasse revealed that he filmed it with his mom watching. "Because I was 17, for legal reasons my mother had to be on the set," he said. "It was real awkward, but it worked out [okay] because when I watched the movie with her, the sex scene wasn't awkward because she'd been right there when it happened."

But was it really okay? "Afterwards, we didn't talk about it," he confessed, "we still don't speak about that moment."

Nick Jonas' stinky first kiss

If you thought that you were the only one with a bad first-kiss experience, rest assured, you're not alone. In an interview with BBC 1's School Run (via ET Online), pop prince Nick Jonas admitted that his first kiss was with former Disney star and then-girlfriend Miley Cyrus outside a California Pizza Kitchen in Hollywood. It was "very romantic," he said sarcastically. "I'd just had a pizza that had onions all over it, I'm sure that my breath smelled terrible." When asked if he thought it was a memorable kiss for Cyrus, he quipped, "I don't know. I'd have to ask her. But I'm sure she does. It was probably pretty potent."