The themes for this week's 'X Factor' have been announced, with the contestants set to perform the songs of two different acts.

According to The Sun, both Take That and Elton John will be honoured on the show this week.

Read our 'X Factor' blog and comment here.

A source said: "The plan is for the acts to do one up-tempo number and a more ballady one to show off both sides of their voices."

"Learning two songs is killing them."

The source also said that choreographer Brian Friedman will be working closely with the remaining acts this week.

"Brian is having to come up with loads of energetic dance routines for them."

"Some, like Olly and Danyl, are convinced that the key to their survival is down to them having a big performance."