The 31-year-old actor and rumoured girlfriend Alia posed in beach wear on the cover, ahead of the release of their film 'Kapoor & Sons'.
Sidharth indulged in a Twitter war with the former 'Bigg Boss' contestant after he posted offensive comments calling the 22-year-old actress "bacchi" following which the 'Brothers' star told him to "shut up".
"I am surprised that a person like him have so many followers on Twitter. I was online by chance, when he started posting cheap comments," Sidharth told PTI.
"I just couldn't stop but react to it. It's not about Alia. I would have reacted the same way for any other girl, if I had noticed something on my page from him before," he added. KRK went on to give death threats to the "Kapoor & Sons" actor, but he is least bothered about such statements.
"I don't care about such threats. I am not afraid of standing against wrong."
The young star was speaking on the sidelines of the ongoing Lakme Fashion Week Spring/Summer 2016 where he walked the ramp for designer Kunal Rawal.