1、as a phrase it is correct. 作为一个短语，它是对的。 That beautiful girl 那个漂亮的姑娘 2、But it isn't a complete sentence. If you want say "That girl is very beautiful." ——You could say: 那个姑娘很漂亮。】

Thanks so much

Depending on what is the context. The phrase itself is correct.

Thanks

Correct