Suppose $X\_1 ,..., X\_n$ is a random sample from u{0,$\theta$} consider the estimator $\hat{\theta} = X\_n$, is it unbiased?

So far I have 
E($\hat{\theta}$) = E($X\_n$) = ${\theta}$($\frac{n}{n+1}$) therefore $X\_n$ is a biased estimator but I have no clue if I'm even on the right track.