• Slide 1 of 10: <p>The supermodel and her twin sister, Patricia, are understandably inseparable — which is made clear on Gisele's social accounts, where she regularly gushes about her sibling. "Thank you for being always there for me, since the very beginning," Gisele posted on Instagram, captioning a pic of the pair. "I love you so much."</p>
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  • Slide 4 of 10: <p>"We're twins ... and I consider him my best friend," Mila Kunis's leading man <a href="http://www.twincities.com/2012/02/02/michael-kutcher-talks-about-twin-brother-ashton-life-with-cerebral-palsy/">said of brother Michael</a>, who was diagnosed with cerebral palsy at age 3.</p>
  • Slide 5 of 10: <p>They may be twin sisters, but the Ronson siblings' respective careers couldn't be more different: Charlotte is a fashion designer while Samantha is a deejay.</p>
  • Slide 6 of 10: <p>No surprise here: Alanis revealed her admiration for sibling, Wade, who has been a yoga instructor since 1995. The "You Oughta Know" crooner also shared the duo share a mutual passion for music: "I am a huge fan of my twin brother, Wade Morissette's kirtan music." </p>
  • Slide 7 of 10: <p>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.</p>
  • Slide 8 of 10: <p>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.</p>
  • Slide 9 of 10: <p>"I think ever since we were little there's been this healthy competition," <a href="http://www.essence.com/2014/01/27/exclusive-tia-tamara-talk-sibling-competition-and-quitting-reality-tv">Tia told Essence exclusively</a> 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."</p>
  • Slide 10 of 10: <p>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," <a href="http://ew.com/article/2015/06/30/dylan-and-cole-sprouse-nyu-graduation-pranks/">Dylan told Teen Vogue</a>, with Cole adding that the twin brothers accepted each other's diplomas at graduation. "No one's going to notice."</p>
Slide 1 of 10: The supermodel and her twin sister, Patricia, are understandably inseparable — which is made clear on Gisele's social accounts, where she regularly gushes about her sibling. "Thank you for being always there for me, since the very beginning," Gisele posted on Instagram, captioning a pic of the pair. "I love you so much."
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1/10 SLIDES © INFGoff

GISELE BUNDCHEN

The supermodel and her twin sister, Patricia, are understandably inseparable — which is made clear on Gisele's social accounts, where she regularly gushes about her sibling. "Thank you for being always there for me, since the very beginning," Gisele posted on Instagram, captioning a pic of the pair. "I love you so much."
2/10 SLIDES © Gary Gershoff/WireImage