Olivia Wilde & Tao Ruspoli
Before settling down and having kids with Jason Sudeikis, Wilde was married to Ruspoli, the son of Italian aristocrat Alessandro Ruspoli, 9th Prince of Cerveteri. The couple split in 2011.
Rob Lowe & Princess Stéphanie
Lowe nearly went from Hollywood to Your Highness when he had an '80s fling with Princess Stéphanie of Monaco, the singer-model daughter of Grace Kelly and Prince Rainier III.
Meghan Markle & Prince Harry
After keeping their romance mostly secret for over a year, the palace announced they are engaged to be married in November 2017. The Suits star is set to give up acting to focus on her royal duties.
Diane von Furstenberg & Prince Egon von Furstenberg
The designer got her famous name by marrying Germany's Prince Egon von Furstenberg in 1969. The duo had two children, Prince Alexander and Princess Tatiana, before splitting in 1972. Before she lost her title, she went by Her Serene Highness Princess Diane of Furstenberg .
Grace Kelly & Prince Rainier III
Like Meghan Markle, Kelly gave up acting to marry Prince Rainier III of Monaco in 1956. They have three children.
Jessica Chastain & Gian Luca Passi de Preposulo
Passi de Preposulo's Italian aristocratic lineage of counts and countesses dates all the way back to the year 973, meaning the Oscar-nominated actress could claim countess now that they're officially married (however, Italy no longer recognizes descendants of its former royal families as being royal).
Jamie Lee Curtis & Christopher Guest
The Hollywood stars married back in 1984, but Curtis didn't become nobility herself until 1996 when Guest inherited the title of Baron upon his father's death. The couple's British royal titles are Baron Haden-Guest and Lady Haden-Guest.
Casper Van Dien & Catherine Oxenberg
The Starship Troopers hunk upped his status when he married the Dynasty actress, who is the daughter of Princess Elizabeth of Yugoslavia and a second cousin once removed of England's Prince Charles. They divorced in 2015.
Zsa Zsa Gabor & Frédéric Prinz von Anhalt
The legendary actress and her ninth husband bagged his royal title by paying Princess Marie Auguste of Anhalt to adopt him as an adult.
Rita Hayworth & Prince Aly Khan
The Hollywood icon put her career on hold to marry Prince Aly Khan (a descendant of the Iranian royal family and son of Sultan Muhammed Shah) in 1949. The couple divorced in 1953 after having one daughter, Princess Yasmin Aga Khan.
A.J. Langer & Charles Courtenay, 19th Earl of Devon
The former My So-Called Life star became Lady Courtenay when she married British aristocrat and attorney Charles Courtenay in 2004. Langer, who now lives in a castle in England, was upgraded to Countess of Devon after his father's death in 2015.
Gad Elmaleh & Charlotte Casiraghi
The Moroccan-French comedian, who's had parts in films like Midnight in Paris and Jack and Jill, was in a relationship with Princess Caroline of Monaco's daughter Charlotte Casiraghi until in 2015.