'Glee' are making another Britney Spears-themed episode.

The hits of the new 'X Factor' judge - who made a cameo appearance on the show in 2010, drawing a record number of viewers for the musical drama - will be used in the second episode of the fourth series of the programme later this year, but the singer herself will not be in any scenes.

Unlike Britney's first 'Glee' tribute, the new episode will not

focus on her namesake in the show, Heather Morris' character Brittany S. Pierce, EW.com reports.

Eight Britney tracks will be used in the episode, which will air in its new Thursday night slot in the US - immediately after 'The X Factor' results show.

Meanwhile, 'Glee' actor Chris Colfer has revealed that Sarah Jessica Parker's recently-announced cameo on the show will see her play a mentor to his character Kurt Hummell.

He said: ''I just found out last night that Sarah Jessica Parker is coming on our show to be my mentor of sorts.''

Kate Hudson will make a six-episode appearance in a role that is described as very ''dance heavy'' and believed to be a mentor to Rachel Berry, the character played by Lea Michele.