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"Following in the footsteps of Britney Spears, Josh Groban and... erm... Ricky Martin, pop sensation Adam Lambert will appear on Glee in the musical melodrama&amp;#039;s upcoming fifth season - it&amp;#039;s the second TV acting outing for Lambert in as many months, with the &amp;#039;Never Close Our Eyes&amp;#039; singer previously popping up on ABC Family&amp;#039;s Pretty Little Liars in October 2012...   Of course, Lambert&amp;#039;s not the first musician to try and turn his hand to this acting lark - many have tried (and failed) in the past. Here&amp;#039;s a look at five of the best - and worst - examples from the annals of TV history. Friday Fiver - Carrie Diaries, Teen Wolf: US hits that need a UK home Friday Fiver - Friends, Fresh Prince, Blackadder: 5 sitcoms we want back on TV David Bowie in Extras Bowie already had some acting experience thanks to his appearances in big-screen classics The Man Who Fell to Earth (1976) and Labyrinth (1986) but his most memorable acting jaunt of recent times was his cameo in self-referential Ricky Gervais sitcom Extras - relive &amp;quot;chubby&amp;quot; Andy&amp;#039;s humiliation at the hands of the Thin White Duke below...      Geri Halliwell in Sex and the City Forget Spice World - Geri&amp;#039;s acting nadir is easily this excruciating Sex and the City cameo. Even her scene partner Kim Cattrall (Samantha) looks embarrassed by Ginger Spice&amp;#039;s &amp;#039;efforts&amp;#039;...      Morrissey in Brookside South One of the most baffling TV moments of all time was morose Mozza&amp;#039;s utterly pointless cameo in this 1988 soap special. Looking like he&amp;#039;s wondered on to the set by mistake, the former Smiths frontman awkwardly mumbles his way through five lines of dialogue before departing. What difference did his cameo make? It made none.      Justin Bieber on CSI The media may be abuzz with Bieber&amp;#039;s latest bouts of bad behaviour, but it all started with his two-episode stint on CSI, which saw the Biebs play bomber Jason McCann. The devious teen was ultimately blown away by granite-jawed Nick Stokes (George Eads) - his bloody demise spawning a million gifs and YouTube parodies online.      McFly in Casualty Bless Tom, Danny, Harry and Dougie - top-quality popstars they may be, but acting is perhaps not the lads&amp;#039; forte, as this awkward cameo in the BBC&amp;#039;s medical marvel (it&amp;#039;s still alive!) Casualty proves. And don&amp;#039;t get us started on their big-screen venture opposite LiLo in 2006&amp;#039;s Just My Luck...      Have we missed out any amazing (or painful) popstar TV cameos? Share your favourites below! "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/glee/news/a497911/adam-lambert-joins-glee-five-more-popstars-turned-tv-stars/>