Salma Hayek
The Mexican star moved to the United States in 1991 to study acting. She remained in the country after her visa expired.
"I was an illegal immigrant in the United States," Hayek told the Spanish edition of V magazine in 2010. "It was for a small period of time but I still did it."
Her immigration status was quickly remedied after Hayek returned to Mexico and renewed her visa. The actress became a naturalized U.S. citizen in 2013.
Sofia Vergara
The Colombian Modern Family actress became a naturalized U.S. citizen in 2014.
"It took me a lot of time to get my residence even though I was working here for a long time," she said on Jimmy Kimmel Live! "But it was fun and I got all my questions perfect."
Craig Ferguson
The former Late Late Show host and Scottish star became a U.S. citizen in 2008. Video of him taking his U.S. citizenship test and taking his oath aired on his program.
Nicole Kidman and Keith Urban
The Australian-born couple are also U.S. citizens.
Pamela Anderson
The Canadian-born actress moved to the U.S. in the late '80s and became a dual citizen in 2004.
Jim Carrey
The Canadian funnyman moved to L.A. in the late '70s to pursue standup comedy amid a comedy boom. He also became a dual citizen in 2004.
Natalie Portman
The actress was born in Jerusalem and immigrated with her family from Israel to the U.S. when she was 3. She has duel citizenship.
Charlize Theron
The South African actress obtained U.S. citizenship in 2007.
"You're stuck with me now," she told David Letterman on The Late Show the following year.
Liam Neeson
The Irish Taken actor became a naturalized U.S. citizen in 2009.
Emily Blunt
The British actress and wife of John Krasinski has lived in the United States since 2008 and became a naturalized citizen in 2015.
Camila Alves
Matthew McConaughey's wife, who is originally from Brazil, got sworn in as a naturalized U.S. citizen at the same ceremony as Emily Blunt.
Patrick Stewart
The British Star Trek and X-Men star has been living in New York for years with American wife Sunny Ozell, who he married in 2013. In 2017, he announced he is applying for U.S. citizenship.
Yolanda Hadid
The Dutch former Real Housewives of Beverly Hills star became an American citizen in 2013.
Arnold Schwarzenegger
The Terminator star and former governor of California immigrated to the U.S. in the late '60s and became a citizen in 1983.