In the photos, the 'Raees' star is seen in a white backless dress, smoking with actor Ranbir Kapoor in New York.
The actor was trolled on social media and was also at the receiving end of slut-shaming.
The comments on the Internet ranged from questioning Mahira, such as "how could a Muslim girl wear semi-naked dress" to others asking how a mother of one child "behave like this."
When asked about her reaction, Parineeti told reporters, "I'll just say one line. It's a little unfair. Everybody knows it's unfair and it'll stop. Today, because of social media, everything becomes too big a deal."
The actor was speaking at the trailer launch of 'Golmaal Again'.
Varun also came out in support of Mahira.
"Shame on them for shaming her," Varun said in an interview while responding to the story.
Pakistani star Ali Zafar also took to Instagram and wrote, "What has happened to us? Have we lost all sense of sensibility?
"Must we choose gossip, intrigue and the self-appointed right of judgement over restrain, grace, tolerance and compassion?"
Continuing with the letter, the actor wrote, "Every woman has the right to make her own choices in life (as long as she's not hurting anyone else) just like we men do.
"How we react defines our own character. Choose wisely for we all shall be judged."...