Lookalike (noun)

1. A person who closely resembles another person, especially a celebrity.
2. A person or thing that closely resembles another.

Origin:

1930s: from look + alike.

Examples:

1. The celebrity was often followed by her lookalike.
2. The museum had a wax figure of the president that was an uncanny lookalike.
3. He always gets mistaken for his celebrity lookalike.
4. The new phone model is a lookalike of the iPhone.
5. The lookalike contest was a big hit at the fair.