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"Adam Lambert sings a Lady Gaga track in his debut on Glee, a trailer for the show has revealed. The American Idol alum - who was announced as a new cast member in July - performs &amp;#039;Marry the Night&amp;#039; in the short promo for &amp;#039;A Katy or a Gaga&amp;#039;.      He is joined on stage by guest star Demi Lovato, who made her debut in last week&amp;#039;s episode as Dani and can be seen in the trailer playing guitar. Lambert will play the character of Elliott &amp;#039;Starchild&amp;#039; Gilbert in the show. &amp;quot;It was such a warm welcome on my first day on set,&amp;quot; he has said. &amp;quot;The cast were so sweet and they have a family vibe so I instantly felt I was in a safe, creative place with them, and we jumped right in.&amp;quot; Glee is currently on a short hiatus following last night&amp;#039;s episode &amp;#039;The Quarterback&amp;#039;, which aired as a tribute to the late Cory Monteith. The show will return in the US with Lambert&amp;#039;s debut episode on November 7. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/glee/news/a523004/glee-adam-lambert-sings-lady-gaga-in-first-look-promo-watch/>