Mildred Baena’s son, believed to be the former California governor’s love child, was born on October 2, 1997, according to documents unearthed today.
The actor and his wife Maria Shriver welcomed their second son, Christopher, on September 27 that same year.
Baena and Shriver would have encountered one another daily while pregnant, with Baena working in the family home but living elsewhere.
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Schwarzenegger and Shriver have three other children together: Katherine, 21, Christina, 19, and Patrick, 17.
A birth certificate obtained by TMZ lists Baena’s then-husband, Rogelio Baena, as the father.
However divorce documents filed in February 2008 state the couple have ‘no minor children,’ which suggests her husband had discovered she had been unfaithful.
It has been claimed that Schwarzenegger did not discover he was the parent until the child was a toddler.
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While the identity of the boy, now 13, is being protected, observers have noted that his mouth and teeth closely resemble the star.
Neighbours today described the teen as ‘is the type of kid you just want to be around. He is so sweet, funny, and handsome.’
He is said to enjoy sports, school and is involved in local charities.
Sources today claimed Guatamala-born Baena, whose duties included cleaning, laundry, cooking and other chores, began to ‘pursue Arnold’ in the late Nineties.
It has been reported that Schwarzenegger and Baena had unprotected sex in the family home during the affair.
Baena did not sleep in the marital home and instead Schwarzenegger, who is described as having a strong sexual appetite, would have unprotected liaisons with her during the daytime, the website reports.
Shriver was a superstar presenter for NBC News at the time.
Once her husband announced his plans to run for governorship, she took unpaid leave of absence from NBC News to support her husband’s political aspirations. She quit her job in 2004 to focus on her role as First Lady of California.
Baena finally gave up her job in January after 20 years in the service of Schwarzenegger. Her son is said to have been an ‘occasional presence’ at the family’s home.
Schwarzenegger is understood to have been ‘generous’ to Baena after learning had fathered her child.
She now lives with her four children in a modest four-bedroom house in Bakersfield, about 120 miles north of Los Angeles, which neighbours said Schwarzenegger bought for her as a ‘retirement gift’. They said Baena lives with a new partner, Alex.
A joint investigation by RadarOnline and Star magazine in the U.S. led to the naming of the mistress last night.
‘She is the one,’ a source told the website.
Photos posted online by Baena, known as Patty, show her and a young boy. She claims on a social networking site to be ‘single’ and ‘dating or searching for a serious relationship’. Baena also describes herself as a ‘proud parent’.
Schwarzenegger told his wife about the child after he left office in January – leading to the couple’s separation.
‘This is a painful and heartbreaking time,’ Shriver said yesterday.
‘As a mother, my concern is for the children. I ask for compassion, respect and privacy as my children and I try to rebuild our lives and heal. I will have no further comment.’
Their son Patrick tweeted yesterday: ‘Some days you feel like sh*t, some days you want to quit and just be normal for a bit, yet I love my family till death do us apart. #family.’
He later changed his onscreen name to Patrick Shriver, from Schwarzenegger. His sister, Katherine Schwarzenegger, commented later in the day.
‘This is definitely not easy but I appreciate your love and support as I begin to heal and move forward in life,’ she said. ‘I will always love my family!’
Earlier in the day, a number of websites claimed that another woman Tammy Tousignant had also had a lovechild with Schwarzenegger.
A former flight attendant on the actor’s private plane, she yesterday denied that her son Tanner was his.
The boy is now 22. In a Facebook message yesterday, he wrote: ‘I’m not his son…. don’t waist your time. it was just a stupid story made up 8 years ago.’
After finding out about the affair Shriver moved out of the family home and into a hotel.
She is said to have been ‘miserable’ in her relationship for several years but did not want to end her marriage because of her strong Catholic beliefs.
Last night she appeared alongside Oprah Winfrey, an old friend, as the chatshow host filmed her final show.
Wearing a blue dress and with her hair styled in waves, Shriver posed alongside Oprah in front of the audience, smiling and laughing.
The LA Times said that when it approached the mother of Schwarzenegger’s lovechild after his statement was released, she declined to comment further.
Baena told the paper she voluntarily left her position with the couple ‘on good terms’.
She said: ‘I wanted to achieve my 20 years, then I asked to retire.’
However, there are new claims Baena was sacked by Schwarzenegger in a desperate bid to keep his affair and love child a secret.
Baena is rumoured to have been considering going public with news of their affair.
In a further revelation website TMZ claimed that Schwarzenegger used his Santa Monica office for meetings with a series of women, around five to seven years ago.
The women would arrive in the early hours of the morning, carrying manilla envelopes. After meeting with Schwarzenegger for several hours they would then leave.
The world was stunned earlier this month when Schwarzenegger and Shriver announced they had split after 25 years of marriage, with many questioning the reasons behind the break-up.
They released a statement which read: ‘This has been a time of great personal and professional transition for each of us.
Shriver then took to Twitter to thank her fans for their support after announcing the split, writing: ‘Thank you all for the kindness, support and compassion. I am humbled by the love. Thank you.’
And, at an appearance last week at the Los Angeles’ Skirball Cultural Center, Schwarzenegger suggested there was a chance of reconciliation.
He said: ‘We both love each other very much. We are very fortunate that we have four extraordinary children and we’re taking one day at a time.’
Earlier this week, an actress claimed she was just one of many of his mistresses.
Schwarzenegger has long been plagued by allegations of womanising and boorish behavior towards females.
His 2003 campaign for governor was rocked by the ‘Gropegate’ scandal – allegations from six women who said he had groped them on movie sets, in studio offices and in other settings over the past three decades, without their consent.
Despite not wanting him to go into politics Shriver stood by her husband, describing his blanket apology to any women he offended as ‘courageous.’
Her backing is widely thought to have helped Schwarzenegger to election.
‘I wouldn’t be standing here if this man weren’t an A-plus human being. I wouldn’t be taking my time, I wouldn’t have left my job that I love, I wouldn’t be doing any of this if I didn’t believe in this man,’ she said in a speech to a Republican women’s group in Orange County in 2003.
She called him ‘an extraordinary man’, adding: ‘He’s honest, he’s sensitive, he’s sincere. And he is gracious with every bone in his body.’
The couple married on April 26, 1986, in a lavish ceremony in Hyannis, Massachusetts, near the Kennedy family compound.