Kristy McNichol and Martie Allen – 25+ Years Together

Actress Kristy McNichol became famous as a child star, thanks to shows like Family and hit movies like Little Darlings, living her life out in front of millions. But, after nearly two decades in Hollywood, the spotlight took its toll and McNichol retired to a private life in 2001.
Some years later, McNichol revealed a secret she had held onto for quite some time: she is a lesbian. As she told People Magazine, film production companies told her to hide her sexual orientation from the public, because they felt worried a lesbian could not become a teen star. Thankfully, since stepping away from Fame, McNichol has lived a quiet, happy life with her partner since the early 1990s, Martie Allen. They are very private and the right-hand picture above is the only known photo of them, with McNichol on the left and Allen on the right.
Christian Bale and Sibi Blazic – 21 Years Together

There are plenty of celebrities who like to flaunt their relationships on the red carpet. However, others, like actor Christian Bale and wife Sibi Blazic, prefer to keep their personal life out of the public view. Blazic and Bale first met in 1999, when she worked as an assistant to Winona Ryder, and started dating immediately. As the two are very private people, they kept their relationship under wraps. They also secretly married within a year of dating, in Las Vegas. An Elvis impersonator reportedly even officiated the marriage!
Still, Bale knows when to take the time to thanks his wife publicly. When he won the best Best Supporting Actor Oscar in 2011, Bale said: “[My wife] had to be married to so many different characters over our marriage. I know that it truly would be impossible to do it without her. She’s such a good, strong woman.”
Sarah Jessica Parker and Matthew Broderick – 29 Years Together

While actress Sarah Jessica Parker and her husband Matthew Broderick frequently portray free spirits, they are actually one of the most stable celebrity couples ever. These two Broadway veterans met, unsurprisingly, on Broadway. In 1995, Broderick had just joined the Naked Angels Theater Company, founded by Parker’s brothers, Pippin and Toby. When the brothers introduced them, the future couple quickly clicked over shared interests.
By 1997, the two had married in a beautiful ceremony in a historic synagogue. Since then, they have welcomed three children: James, Marion, and Tabitha. During an interview, Broderick jokingly said that they keep the spark alive by arguing about baseball! After all, he’s a Mets fan, while Parker is a Yankees fan.