As a goodwill gesture towards Salman's family

Salman Khan and Katrina Kaif's is a classic case of exes continuing to stay good friends. And in this case Katrina seems to be in the mood to do anything to maintain that friendship with Khan and his khandaan.

Katrina, who had earlier said that she's grateful to the Khan family for being so generous to her when she entered the industry, seems to be in a mood to return the favour.

So she shot a song for free in Atul Agnihotri's film, Bodyguard. The song which goes, Aayare aaya bodyguard..., is touted as Katrina's first item number, post the very successful Sheila Ki Jawani.

And though there is every chance that the song would surely add to the entertainment value of the film, some things clearly go beyond money for the actress.

Confirms producer Atul Agnihotri, "It is very gracious of her to have done this. She has always been very supportive of our work and is ready to contribute in whatever way possible."

Interestingly, this is not the only time Katrina has gone that extra mile to keep up her friendship with the Khan family.

Adds Atul, "We have all known her for years now and she is part of our family. Even in my earlier film Hello, she had to do a guest appearance and she did it free of cost."

Though Salman has admitted to not really having watched a single film of Kat's, the actress makes sure she invites Salman's sister Alvira Khan for every special screening of her films.

Adds a source, "Just before the release of her film Raajneeti, even when rumours were rife that all is not well between Katrina and Salman, she made sure she invited Alvira for her preview."