Today is Kate Upton's birthday, and we have to admit we're a little surprised she's only 22. Upton has already spent three consecutive years on the cover of Sports Illustrated's coveted Swimsuit Issue, in addition to many other magazine covers across the globe. In 2013, Upton was named Model Of The Year at the Style Awards, and in April 2014 she made her film debut alongside Cameron Diaz and Leslie Mann in "The Other Woman."
Meanwhile, Shailene Woodley, who is also 22, plays a believable 16-year-old in "The Fault in Our Stars." It's pretty hard to believe these two actresses are the same age.
Browse through our slideshow for 19 more celebrity pairs who share unexpectedly similar birth dates:
More Upton joy since, you know, it's her birthday!