We love getting to see celebrities with their siblings [1] (whether they're famous or not [2]) but there are also many stars who grew up as the only kid in their home. There is tons of science behind being an only child and many surprising perks to being the parent of one kid [3]. Keep reading to see 22 celebrities who are only children, then check out the stars that you didn't know had twins [4].

Adele

Drew Barrymore

Sarah Michelle Gellar

Leonardo DiCaprio

Maria Sharapova

The Weeknd

Lea Michele

Robert De Niro

Charlize Theron

Alicia Keys

Daniel Radcliffe

Pierce Brosnan

Lenny Kravitz

Brooke Shields

Natalie Portman

Jack Nicholson

Ciara

Chelsea Clinton

Matthew Perry

LeAnn Rimes

Elton John

Christina Applegate