Sure, in many cases they have the same last name, but you may be shocked to find out which famous faces actually share genes.
Ben Affleck and Barack Obama(Credit: Getty Images)
"Batman" actor Ben Affleck is reportedly the 11th cousin of former President Barack Obama.
Dakota Johnson and Melanie Griffith
"50 Shades Darker" star Dakota Johnson is the daughter of actress Melanie Griffith.
Brad Pitt and Barack Obama(Credit: Getty Images)
Actor Brad Pitt is reportedly the ninth cousin of former President Barack Obama through a Virginia ancestor who died in 1769.
Warren Beatty and Shirley MacLaine(Credit: AP)
"Bonnie and Clyde" actor Warren Beatty is the younger brother of Hollywood legend Shirley MacLaine, who told Oprah, "When we were kids, I really did protect him. He always wanted to tag along with me and my girlfriends, but I always said, 'No, no, go home.' "
Stella McCartney and Paul McCartney(Credit: AP)
Eco-friendly British fashion designer Stella McCartney is the daughter of The Beatles' Paul McCartney.
Melissa McCarthy and Jenny McCarthy(Credit: AP)
"Ghostbusters" actress Melissa McCarthy, left, is the cousin of actress and former Playboy model Jenny McCarthy, who revealed their relationship when she tweeted, "Congrats to my cousin melissa mccarthy on her Emmy win!!" when the "Mike & Molly" star took home the award in 2011.
Alan Thicke and Robin Thicke
The late "Growing Pains" dad Alan Thicke, left, was "Blurred Lines" singer Robin Thicke's father.
Halle Berry and Sarah Palin(Credit: Getty Images)
In a 2012 interview with "Extra," Halle Berry revealed she is related in "some twisted way" to controversial Republican and former governor of Alaska Sarah Palin.
Brian Williams and Allison Williams(Credit: Getty Images)
"Girls" star Allison Williams is the only daughter of Brian Williams, currently the host of MSNBC's "The 11th Hour With Brian Williams."
Tatum O'Neal and Joanna Moore
The youngest-ever actress to win an Academy Award, Tatum O'Neal, is the daughter of the late actress Joanna Moore and actor Ryan O'Neal.
Emily Deschanel and Zooey Deschanel(Credit: AP)
The unusual last name gives this one away: "Bones" actress Emily Deschanel, right, is a big sister to Zooey Deschanel. The sisters presented together at the 2013 Primetime Emmy Awards.
Bryce Dallas Howard and Ron Howard(Credit: AP)
"Jurassic World" actress Bryce Dallas Howard is the daughter of "Happy Days" actor turned successful Hollywood director Ron Howard.
Jamie Lee Curtis, Tony Curtis and Janet Leigh(Credit: AP)
Jamie Lee Curtis is the daughter of late actors Tony Curtis and "Psycho" star Janet Leigh. Jamie Lee Curtis was six weeks old in this 1959 photo taken with her parents and older sister Kelly Curtis.
Brandy and Ray J(Credit: AP)
"The Boy Is Mine" singer Brandy Norwood, who was known simply as "Brandy" at the height of her career in the late 1990s, is big sister to Kim Kardashian's ex-boyfriend Ray J, who is also an R&B singer.
Daisy Lowe and Gavin Rossdale(Credit: AP)
In 2004, a DNA test revealed British model and actress Daisy Lowe, then 15, is the daughter of Bush lead singer Gavin Rossdale, who was married to Gwen Stefani until 2016. Rossdale and Lowe's mother, Pearl Lowe, reportedly had a five-year relationship in the late 1980s.
Jerry Stiller and Ben Stiller(Credit: Getty Images)
"The King of Queens" comedian Jerry Stiller, left, is Ben Stiller's dad.
Rashida Jones and Quincy Jones(Credit: AP)
"Parks and Recreation" actress Rashida Jones is the daughter of music producer Quincy Jones.
Lily Collins and Phil Collins(Credit: Getty Images)
"Mirror Mirror" actress Lily Collins is the daughter of English musician and former Genesis singer/drummer Phil Collins.
Debbie Reynolds and Carrie Fisher(Credit: AP)
"Singin' in the Rain" star Debbie Reynolds, left, was the mother of the late "Star Wars" actress Carrie Fisher.