To evaluate the expression \( 8^{\log_8{3}} \), we can utilize the property of logarithms and exponents that states:
\[ a^{\log_a{x}} = x \]
In this case, \( a = 8 \) and \( x = 3 \).
So applying this property, we get:
\[ 8^{\log_8{3}} = 3 \]
Thus, the value of the expression \( 8^{\log_8{3}} \) is \( \boxed{3} \).