With advances in medicine and science, the rates of twin births are higher than they've ever been.
But that doesn't make them any less special.
In my own family there are no twins, even in my extended family, so I'm always a little jealous of celebrities who are doubly blessed with two adorable children.
And it seems like celebrities are even likelier to have twins than the rest of us:
1. Jennifer Lopez
Jennifer Lopez gave birth to twins Maximilian and Emme in 2008, the children of her then-husband, singer Marc Anthony.
The couple have since divorced, but J-Lo insists they're "great friends" and "great parents together."
The singer is raising her now 10-year-old twins with the help of her current boyfriend, baseball player Alex Rodriguez.
2. Steve Harvey
His first wife, Marcia Harvey, gave birth to twin daughters named Karli and Brandi.
Now fully grown, Harvey's daughters appeared on his show for "Twin Week."
3. Chuck Norris
The action movie legend has seven children from his two marriages, including a pair of stepchildren and a lovechild who he didn't meet until she was fully grown.
Norris's twins, Dakota Alan and Danilee Kelly, were born to his second wife, model Gena O'Kelley.
4. Mel Gibson
The Australian movie star fell in love with dental nurse Robyn Moore before he was famous, and the couple stayed together for more than 25 years.
The pair had a daughter and six sons together, including twins Edward and Christian, before splitting up following Gibson's infamous drunk driving arrest.
5. Denzel Washington
This movie star is a devoted husband: he's been married to his wife Pauletta Pearson since 1983, and they have three children together.
His twins, Olivia and Malcolm, seem to be interested in the family business.
Malcolm earned a degree in film studies while Olivia had a role in The Butler.