She may be older than her fraternal twin brother, Hunter, by three minutes, but Scarlett continues to bring the political activist as her date to red carpet events.
"We're twins ... and I consider him my best friend," Mila Kunis's leading man said of brother Michael, who was diagnosed with cerebral palsy at age 3.
Mary-Kate & Ashley Olsen
Hands down, Hollywood's most recognizable set of twins, Mary-Kate and Ashley have been through everything together — from making their TV debut on Full House as babies to launching their super-successful fashion lines years later.
Joel & Benji Madden
The Madden brothers are a lucky pair! Not only did they catapult to fame with their rock band Good Charlotte, but Joel and Benji are married to the coolest ladies around: Nicole Richie and Cameron Diaz, respectively.
Tia & Tamera Mowry
"I think ever since we were little there's been this healthy competition," Tia told Essence exclusively of her and sister Tamera's dynamic. "If I see my sister doing something or vice versa it's like 'Oh ok, I can do that too.' If I see her succeeding at it, it's encouraging."
Dylan & Cole Sprouse
The Suite Life of Zack & Cody costars not only acted alongside each other on the hit Disney channel show, but also attended New York University together — where they pulled their fair share of pranks. "If you look up my graduating photo you'll see. We just decided, you know, there's no reason not to," Dylan told Teen Vogue, with Cole adding that the twin brothers accepted each other's diplomas at graduation. "No one's going to notice."
This article originally appeared on PEOPLE.com.