Open Marriages: Hollywood’s Worst Kept Secret?
Newt Gingrich and Callista Gingrich

Georgia politician Newt Gingrich tried for years to convince wife Callista to engage in an open marriage with him, according to Callista herself. Although Newt now denies this to be true, he claims that he has been unfaithful throughout their marriage.
Considering Newt has infamously jumped from wife to wife, cheating on them all has been the only consistency that he seems to have provided over the years, which is probably why he thought he would be safer in an open marriage with a woman that served as a catalyst for his last divorce.
Pink and Carey Hart

When the rough-edged singer and professional motocross rider first got together, Pink agreed to an open marriage based on a “don’t ask, don’t tell policy.” Judging from Pink’s hard exterior developed over a lifetime of drugs, it is not that shocking that she would be open to sharing her man.
That was until Carey found a young, hot blonde that served as arm candy everywhere he went; Pink wasn’t so cool about it then. After splitting up for a bit, the couple reunited and worked things out for their daughter, Willow. They are reportedly happy, and have a closed marriage that fulfills them both.