"Vidya had to cancel her plans at the last moment," said a source from the organisers.
The National award-winning actress was due to attend a special session here, but Priyanka Chopra filled in for her.
Vidya was also slated to be part of a Master Class Panel with Hollywood actor Kevin Spacey. Now, Priyanka will attend the same, scheduled to be held here Saturday.
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The IIFA gala started here Wednesday, and it will culminate with a star-studded and glittering awards ceremony Saturday night at the sprawling Raymond James Stadium.