The episode featured a large amount of incidental music . During Gwen 's hen night , the club she is in plays the tracks " Filthy / Gorgeous " and " Comfortably Numb " by the Scissor Sisters from their eponymous 2004 album and the single " Hole in the Head " from the Sugababes 2003 album Three . The song heard on Gwen 's radio Alarm Clock when she wake up heavily pregnant is " Fire in My Heart " from the Welsh rock band Super Furry Animals . At Gwen and Rhys ' wedding reception , the records played include " You Do Something to Me " by Paul Weller and the song " Tainted Love " by Soft Cell . One of the black and white photos of Jack seen at the end of the episode is actually a promotional picture of John Barrowman from his role as Billy Flynn in the musical Chicago .