Actor Vikram has heaped praises on his Ponniyin Selvan: 1 co-star Aishwarya Rai, and said that she has been 'under a microscope' adding that it's 'so very difficult being her'. During a press conference for the promotions of their film, Vikram also recalled an incident when Aishwarya tripped and stumbled making him feel she would 'fall on her face'.