THE first star of the new “Bev erly Hills, 90210” spinoff has been cast.

He’s Dustin Milligan, who’s appeared in TV shows including “Supernatural” and “Runaway” and in movies such as “The Dead Zone.”

In the new show, Milligan will play Ethan, who’s described as a “brainiac” who “possesses other qualities valued in the 90210. Namely, he’s beautiful.”

Milligan, who bears a striking resemblance to original “90210” star Luke Perry’s Dylan McKay, will play Ethan as a “likable, genuine” guy who’s also described in a casting notice as a “star athlete.”

The spinoff, tentatively called “90210,” is among the most highly anticipated new series for the fall season.