Mario Lopez lost his virginity when he was 12.
The 'Extra' host, 40 - who has daughter Gia, four, and 12-month-old son Dominic - had sex before he'd even reached his teenage years and it wasn't until recently that he realised how quickly he'd tried to grow up.
Writing in his new autobiography, 'Just Between Us, ' he explained: "I started having sex so young. The day before my 13th birthday.
"Now that I'm a dad, I look back and I think, 'Oh my God!' But you've got to understand, when you're growing up in the hood, everybody grows up fast."
The hunky star even revealed he got a girl pregnant when he was a youngster and was prepared to get a full-time job to support the unborn child and mother, but the pregnancy was ultimately terminated.
He said: "I could have a kid who is 25 years old. That's unbelievable."
Mario also opened up about his marriage with Ali Landry, which was annulled two weeks after their wedding in 2004 when photographs of him and another woman at his bachelor party started to surface.
He said of the scandal: "I got inebriated and a little too friendly with a young lady.
"When it was time to return home, lightning hit me with the truth: I wasn't in love. But I walked down the aisle. Ali was hurt and angry, rightfully so."
Mario is now married to Courtney Mazza, the mother of his children, and has been since 2012.

Cheryl Fernandez-Versini has praised Kimberley Walsh for how well she's adapted to motherhood.
The former Girls Aloud singer believes her ex-bandmate and best friend is a great mum to her four-week-old son Bobby, whom she has with her long-term partner Justin Scott, but she admits she's eagerly waiting for a chance to bond with the little one as well.
Speaking to The Sun newspaper's Fabulous magazine, Cheryl said: "She was like a perfect, instant mother and Justin is incredible.
"The problem is she won't be parted from [Bobby] for a minute, so I'm having to wait my turn.
"I've got a cot ready at my house. But really I just want a few hours holding him so I can totally bond with him. "But Kimberley is completely in love and won't let him out of her sight yet."
Meanwhile, the 31-year-old beauty faced criticism after she married her French beau Jean-Bernard Fernandez-Versini in a secret ceremony in July following just under a year of dating, but she's adamant she's made the right decision.
She explained: "It was my heart and my head. I'm not an 18 year old, I'm a 31-year-old woman and I know what I'm doing. I'm doing what makes me happy and that is what is right for me."
Cheryl refused to give away too much information about her relationship with Jean-Bernard but she admits she's learnt how to speak French now.
She said with a laugh: "I can speak pretty good French now."

Oprah Winfrey watched Lindsay Lohan perform in 'Speed-The-Plow' last night (04.10.14).
The troubled star, who fluffed her lines on the opening night last week, received a "blessing" from her "fairy Godmother" after the 60-year-old star turned up at the West End production to offer her support.
Taking to her Instagram account, Lindsay posted a photograph of herself and Oprah, alongside the caption: "The definition of a blessing. Thank you @oprah and @Lupita_Nyongo for seeing the show tonight. Love you xx (sic)."
The flame-haired beauty, 28, then added a similar picture to her Twitter account with the message: So thrilled to have @Oprah and @Lupita_Nyongo in the audience tonight. Im a lucky girl! Xxo #myfairygodmother (sic)."
However, Oprah and '12 Years A Slave' actress Lupita Nyong'o weren't the only ones supporting Lindsay last night as her mother Dina also turned up.
She posted a picture of Dina, 52, on Instagram with the caption: "My beautiful mum supporting me! What a blessed life I've found. 🙏 @dinalohan @oprah #speedtheplow (sic)."
Meanwhile, Lindsay and Oprah have struck up a close bond over the past few years as the producer helped the 'Mean Girls' star document her struggles to get her life back on track following a number of stints in rehab.

Cheryl Fernandez-Versini isn't in a rush to have children.
The former Girls Aloud singer married Jean-Bernard Fernandez-Versini in a secret ceremony in July and, although she wants to start a family at some point, she's pleased with how their romance is progressing.
Speaking in the Sunday People newspaper, she said about having kids with Jean-Bernard: "I haven't set a plan and I will let ­nature take its course.
"Right now I am very happy with the way things are."
Meanwhile, the 31-year-old beauty suffered a nervous breakdown in 2010 following her divorce from Ashley Cole, almost dying after catching malaria and getting sacked from the 'X Factor' US, but she insists she's in a much better place now and has learnt from the past.
She explained: "It [the nervous breakdown] will never happen again. I'm more conscious of the pressures now. I feel like a woman, I've grown up."
She added: "I was burnt out and I wasn't taking notice. I should have listened to the signals just to slow down.
"But I got sick [with malaria] and instead of taking the time off, I was like 'No, No,' I am going back to work.
"Within six to eight weeks, I was back on the 'X Factor' and I didn't even have the right blood back."
Cheryl is now a judge alongside Simon Cowell, Mel B and Louis Walsh on this year's 'X Factor' in the UK following a four-year break from the show.

Kelly Brook's ex-fiancé is determined to win her back.
The 34-year-old model dumped David McIntosh last week following a five-month engagement, but the hunk is reportedly jetting to Los Angeles, where Kelly is filming US sitcom 'One Big Happy', next week in the hope of persuading her to give him another chance.
A source told The Sun newspaper: "He is madly in love with Kelly. David feels hard done by and reckons there is still a chance they can save the relationship if they talk face-to-face. He's been posting online about having a great time partying but he wants her back.
"It seems unlikely that Kelly will entertain the idea but David wants to know for sure."
The brunette beauty ditched the former 'Gladiators' star, 28, on Twitter following allegations he had been cheating on her with his ex-girlfriend Sarah Harper.
She tweeted last month: "It's a sad Day but I wanted to share with you that David and I are no longer engaged. I love and respect him and wish him all the best. (sic)."
However, David has since denied that infidelity was the cause of their split.
He tweeted two days later: "There are two sides to every story. You are free to believe what you wish...it doesn't alter the facts. (sic)."

Tamara Ecclestone doesn't know what toast is.
The 30-year-old socialite, who was educated at the private Francis Holland School in central London as a child, admits she's baffled by the name used when bread has been deliberately browned using heat.
Speaking in her upcoming documentary 'Seven Days With... Tamara and Jay', she said as she made her husband Jay Rutland a bacon sandwich: "The secret to Jay's bacon sandwich is brown sauce and he likes the bacon well done and he likes the toast toasted. Is it called bread or toast when it's not toasted?"
A confused Jay replied: "Bread," before adding, "This is what I have to deal with every day."
Tamara explained: "Toast is not bread. Like bread is a whole loaf that hasn't been sliced up. This is clearly toast, it's different. Bread is like what you have in a bread basket at a restaurant."
Jay, clearly baffled by his wife's logic, attempted to put an end to the confusion by saying: "Please just stop now babe."
However, Tamara, who gave birth to daughter Sophia six months ago, was keen to prove her point.
She added: "It's a legitimate question."
Jay finished the bizarre conversation by stating: "Oh God. Are you seriously asking me if toast that is not toasted is still called toast?"

Professor Green slapped a concertgoer on Friday night (03.10.14).
The 30-year-old rapper was caught on camera getting into a scuffle in the middle of his gig at Durham University's Student Union Welcome Ball after a member of the audience shouted abuse at him.
However, the scrap didn't last for very long as the 'Remedy' hitmaker - whose real name is Stephen Manderson - returned to the centre of the stage to explain why he ended up swinging his arms at a fan.
He told the audience: "That's what happens when you call me a c**t. Are we going to have a f***ing good time tonight or what?"
A representative for Pro Green, who is married to reality TV star Mille Mackintosh, confirmed that the star had got into an altercation with a fan during his set and the student was later escorted off the premises.
The spokesperson told the Daily Mirror newspaper: "During Professor Green's live show at Durham University on Friday night, a student verbally abused Green repeatedly and then went to strike him. Green reacted. The student was subsequently escorted out from the venue for being too drunk. Green carried on the show to perform his full set."
Pro Green then appeared to reference the aggressive situation on Twitter after the show but later deleted the post from his social networking site.
He tweeted at the time: "Durham you were a beautiful crowd and F****** LIVELY!"

Shia LaBeouf repeatedly slashed his own face with a knife while filming 'Fury'.
The 28-year-old actor completely immersed himself in a role as a tank's gunner in the wartime drama and stunned his co-stars with the lengths he would go to in order to make his portrayal seem authentic.
Co-star Logan Lerman said: "We were in make-up and they were putting cuts on Shia and I said, 'Yeah, yeah, it looks good.' And Shia was like, 'No, it doesn't look real.'
"Then he walks out into the hallway and says, 'Hey man, wanna see something fun? Check this out...' and he takes out a knife and cuts his face. And for the whole movie he kept opening these cuts on his face. That's all real."
And the 'Nymphomaniac' actor also insisted on having a dentist remove one of his teeth.
Logan added: "I mean, he didn't do it himself, he did go to a dentist and asked them to pull his tooth out but yeah, what an odd request."
Shia - who didn't wash during filming - learned to operate the tank to an expert level and insisted on staying in control of the vehicle even when he wasn't needed on set.
Logan told Britain's GQ magazine: "He really spent every moment on that set. He's the guy operating the turret in every shot, even when you don't need to be in there as an actor. You know, you can have somebody else inside. But he was there, for every shot."

Alexa Chung was nicknamed 'Pants Girl' at college.
The 30-year-old fashionista was less-than-stylish as she was growing up and used to wear a strange assortment of clothes which even led to an embarrassing nickname from one of her teachers.
Alexa told Britain's InStyle magazine: "At sixth-form college, I would wear a cropped Pokemon t-shirt and huge combat skate trousers with my knickers hanging out - my teacher used to call me 'Pants Girl'."
Alexa - who is the new face of Nails Inc - admitted that she is less adventurous with her style statements now, but explained how her nails have remained an outlet for bold textures and patterns.
She said: "These days, the only area I'll experiment with prints and colours is on my nails."
The brunette beauty has previously admitted to considering a face lift as she is worried about the ageing process.
She said: "Sometimes I'm like, 'Oh my god, I'm going to get a facelift', but I don't think I really will. I'll just live in the present and enjoy my remaining youth.
"I do worry about my skin though. I look in the mirror and I'm like, 'Oh hi wrinkles'. But everyone I love - like [singer-songwriter] Patti Smith or [actress] Charlotte Rampling - has wrinkles and they still look beautiful."

Lindsay Lohan has convinced her 'Mean Girls' co-stars to start work on a sequel.
The 27-year-old actress starred in the 2004 teen comedy and she has reportedly convinced original writer Tina Fey and co-star Amanda Seyfried to reunite 10 years on after they took part in a photoshoot for US magazine People.
Meanwhile, insider told the UK's Sunday People newspaper: "Lindsay spent most of her day joking around with her former castmates - including Amanda Seyfried and Tina.
"They all got on so well that they have managed to get Tina to write them a proper sequel.
"It would, of course, See Lindsay make a much-needed return to Hollywood and possibly launch a full-scale movie comeback. This is great news for her."
The star - who is currently starring in the West End play 'Speed-the-Plow' - recently admitted she would love to star in a British movie when the production comes to an end in November.
She said: ""I would love to do a British movie when I'm finished on the stage.
"I'm really settled here in London, so it would be great. Depending on the script, I'm open to all possibilities."

Danny Dyer says Dean Wicks will "get what's coming to him" when Mick Carter finds out about Linda's rape.
The 'EastEnders' actor plays the Queen Vic landlord on the soap, and he has discussed the show's ongoing storyline which sees the aftermath of his character's wife - played by Kellie Bright - being attacked by Dean (Matt Di Angelo).
He told the Daily Star Sunday newspaper: "Let me tell you something now, it's explosive.
"You are going to see a side of Mick that's going to freak you all out. I can't say too much but Dean gets what's coming to him.
"Matt's a lovely boy and it's a tricky thing to deal with. It's a subject that needs to be dealt with in the right way. The way we've done it is really delicate."
The TV hard man explained the soap wants to "encourage" people who have been through similar experiences to open up about it and not "bottle it up".
He added: "We're trying to encourage anyone going through that kind of thing to talk about it and tell the people you love. It's important not to bottle it up and deal with it yourself.
"It has been difficult because obviously I know the storyline but Mick doesn't know.
"All I will say is when he does find out, you're not going to want to miss it."

Michaela Strachan had both her breasts removed after being diagnosed with cancer.
The 'Springwatch' presenter has revealed the upsetting news after being told the news following a routine mammogram earlier this year, and it changed how she looked at her body.
She told the Mail on Sunday newspaper's You magazine: "The tears started to roll as my doctor tried to tell me what would happen next but I only took in every fifth word or so.
"The only work that registered was cancer ... My breasts have never been a big part of my personality - they have always been rather average 34Bs.
"I didn't think I'd feel too emotional about losing them. But knowing that I would in the next few days I found myself wearing tight tops and celebrating them."
Michaela, 48, has encouraged other women to go for regular mammograms, insisting her story could have been "very different" if she hadn't.
She added: "If I'd put mine off, my story would have been a very different one.
"As it is I've had a tough year and an emotional journey but I'm not fighting for my life."