Deepika, 28, had angrily responded to the pictures yesterday, tweeting "Yes! I am a woman. I have breasts and a cleavage! You got a problem!!??"
Sonam, who reportedly does not share a very good equation with Deepika, said the incident was "sad and unfortunate".
"We are constantly being objectified, be it kissing scenes or wearing bikinis. Everything becomes a point of publicity and news. I am sorry that it happened to her. It's obviously not right. I feel bad for her but I feel for the rest of us also," Sonam told reporters here.
Deepika's tweet was trending yesterday, with several Bollywood celebrities like Arjun Kapoor, Anushka Sharma, Karan Johar, Nimrat Kaur coming out in support of the actress.