TV Adam Lambert to Join 'Glee' By Robert Pace 7:44 PM PDT, July 10, 2013 Getty Images Singer-songwriter Adam Lambert will be joining Glee for its fifth season, co-creator Ryan Murphy announced Wednesday evening via Twitter.I am thrilled to announce that the super talented Adam Lambert is joining the cast of Glee this fall. — Ryan Murphy (@MrRPMurphy) July 11, 2013Lambert, who rose to fame as the runner-up on American Idol's Season 9 (won by Kris Allen), has released two albums since signing a record deal shortly after his Idol stint. VIDEO: Adam Lambert Goes 'Glampire' on 'PLL' His most recent album, Trespassing, led by his single "Better Than I Know Myself," has peaked at No. 1 on the Billboard 200 and in Canada as well.While the 31-year-old has little television acting to his name, he has a background in stage acting and had a small role in the 2006 musical film The Ten Commandments: The Musical. VIDEO: Lambert Slams 'Les Mis,' Crowe Responds Glee's Season 5 is slated to premiere September 19 on FOX.