Today is Stella Hudgens' 19th birthday! Vanessa Hudgens' younger sister is a spitting image of the the High School Musical star — if it we didn't know any better we'd totally think they were twins!
The Hudgens sisters aren't the only celebrity siblings who could pass as twins. Click through to see more stars who look identical, then let us know in the comments below who you think looks the most alike.
Stella and Vanessa Hudgens are six years apart!