Kat, Imran, Ali on the sets of 'X Factor'

From left, Ali Zafar, Katrina Kaif and Imran Khan on the sets of television reality show 'X Factor' in Filmcity, Mumbai, ahead of the release of their much-awaited film 'Mere Brother Ki Dulhan'. (Pic: Viral Bhayani)

Katrina Kaif poses with her 'Mere Brother Ki Dulhan' co-stars Ali Zafar and Imran Khan on the sets of 'X Factor' in Filmcity, Mumbai. (Pic: Viral Bhayani)

Katrina Kaif clicked as she graces the sets of television reality show 'X Factor' in Filmcity, Mumbai. (Pic: Viral Bhayani)

From left, Ali Zafar, Katrina Kaif and Imran Khan on the sets of 'X Factor' in Filmcity, Mumbai, ahead of the release of their latest movie 'Mere Brother Ki Dulhan'. (Pic: Viral Bhayani)

Katrina, Imran and Ali pose together for shutterbugs as they grace the sets of TV reality show 'X Factor' in Filmcity, Mumbai. (Pic: Viral Bhayani)

'X Factor - India' judges Shreya Ghoshal (2nd L), Sonu Nigam (2nd L)and Sanjay Leela Bhansali (3rd L) with the finalists on the sets of the show in Filmcity, Mumbai. (Pic: Viral Bhayani)

Bollywood beauty Katrina Kaif looks stunning as she's clicked on the sets of 'X Factor' in Filmcity, Mumbai. (Pic: Viral Bhayani)

Shreya Ghoshal strikes a pose on her way to the sets of 'X Factor' in Filmcity, Mumbai. (Pic: Viral Bhayani)

Sonu Nigam with a contestant on the sets of television reality show 'X Factor'. (Pic: Viral Bhayani)

Renowned singer Sonu Nigam performs on the sets of television reality show 'X Factor' in Filmcity, Mumbai. (Pic: Viral Bhayani)