The song -- `Aaya re aaya bodyguard...` will not only see Shera dancing and grooving with Salman but will also be seen doing a small act with Katrina, sources said.
The song, which was shot recently at Filmcity will see Shera coming in as Katrina`s bodyguard and signalling to Salman that he is guarding the actress, the sources added.
Shera says he was a little apprehensive initially about the dance moves in the song.
"This is for the first time I am in front of the camera with Salmanbhai doing this item song. He just showed me some dance steps and I did a lot of rehearsal before the final take. It was scary and I was nervous. I will never forget this experience," Shera said.
"I have shot the song with Salman Bhai and all this seems like a magic. Salman bhai is such a huge star and for someone like him showing such trust in me is nothing short of a miracle. In front of the whole world he said that this is my most trusted man. Isn`t that great?," he added.
Earlier, Shera had unveiled the theatrical promo of `Bodyguard`.
Directed by Siddique and produced by brother-in-law, Atul Agnihotri, `Bodyguard` stars Salman and Kareena Kapoor.
"It was Salman`s idea to rope in Shera for the song. I am sure audiences will love it," Agnihotri said.
`Bodyguard` is a remake of 2010 Malayalam movie of the same name. It is set to hit cinema-houses on August 31.