Race is certainly a complex subject. In so many cases, it's impossible to determine someone's racial identity just by looking at him or her. The following celebrities prove that point.
The stunning pop star Mariah Carey has a mixed-raced background. Her mother is Irish, and her father is Cuban and African-American. Mariah's paternal grandfather, meanwhile, was Venezuelan, and her family isn't sure whether he was white or black.
Would you ever guess that Cash Warren, husband to Jessica Alba, is of ethnic decent? Believe it or not, Cash is the son of Michael Warren, the "Hills Street Blues" actor.
While this "Gossip Girl" actress definitely has an exotic look and last name, African American probably wasn't your first guess. Jessica is a mix of Hungarian, Caucasian, and African American.
The "Flashdance" actress was born to an Irish mother and an African American father. Due to her biracial ethnicity, Beals says that she always sees herself as "being in the other society" but it has helped her become a better actress.
Where did Pete Wentz, Fall Out Boy's bassist, get his curly hair? It comes from his mom, a Jamaican woman. His maternal grandfather was black, and his maternal grandmother may have been black as well. For his part, Pete's dad is English and German.
Troian Bellisario, a star of the ABC Family drama "Pretty Little Liars," has television in her blood; her parents are TV producers. Troian's blood also contains a range of ethnicities. Her mom is primarily African-American but also French and English, and her dad is Serbian and Italian.
Wentworth Miller's first movie was 2003's "The Human Stain," in which he played a black man pretending to be white and Jewish. Wentworth himself is biracial. This model and actor has a white mother and black father.
Fashion designer and socialite Nicole Richie's father is Peter Escovedo III, an African-American, Creole, and Mexican musician. Her adopted father, of course, is Lionel Richie, and her aunt is Sheila E., a singer who was popular during the 1980s. Nicole's family reunions must be pretty entertaining.
Guns N' Roses guitarist Slash -- whose real name is Saul Hudson -- was born in 1965 to a British father and an African-American mother. And Slash strongly resembles his mom. Given that she was a costume designer, he may have inherited her fashion sense as well.
Rashida Jones -- best known for her role on the NBC sitcom "Parks and Recreation" -- is the daughter of legendary African-American music producer Quincy Jones and the white actress Peggy Lipton. Peggy, by the way, was raised Jewish. When she told her parents that she intended to marry a black man, they were astonished.
Supermodel and actress Adriana Lima hails from Brazil. Moreover, she can claim Japanese, Swiss, Native American, and African roots. But Adriana likes to sum up her diverse heritage with a simple phrase: "Afro-Brazilian."
Maya Rudolph demonstrated on NBC's "Saturday Night Live" that she can convincingly play characters of various races. In real life, Maya belongs to a truly talented and multicultural lineage. Her mother was Minnie Riperton, an acclaimed black soul singer, and her father was a Jewish composer named Richard Rudolph.
Broadway great Carol Channing surprised many people in 2002 when she revealed in her autobiography that her paternal grandmother was black. In 2010, however, she told talk show host Wendy Williams that she was less than certain that her father was half-black. But Carol still hopes that he was.