LAS VEGAS, NV - SEPTEMBER 20: Adam Lambert performs onstage during the iHeartRadio Music Festival at the MGM Grand Garden Are
Kevin Mazur/Getty Images for Clear Channel

Adam Lambert doesn't make his Glee debut until November 7, but you can hear the Idol runner-up lend his pipes to the Fox musical right now. Yep, Lambert's cover of Lady Gaga's "Marry the Night" has hit the Internet, and it's a stunner.

Glambert attacks the Born This Way single with gusto, bringing a theatrical, classic rock wail to the electro-pop banger. It's a winning combination and a tantalizing tease for his appearance on an episode called "A Katy or a Gaga," which focuses on the pseudo-rivalry between the California pop queen and the New York ARTPOP diva. Listen to it below.

P.S. Based on leaked photos, it looks like Lambert will duet with Glee cast member (and Big Sean's fiancée) Naya Rivera as well. Niiiice.