Is Priyanka deliberately skipping KJo's birthday bash?

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The actress was on her way to Switzerland to attend her brother Siddharth's graduation, who is studying catering and hotel management there. Interestingly, PC had also gone to Switzerland in June last year to attend her brother's graduation ceremony.

She had even posted a pic of her with him at the ceremony on her microblogging site. Wonder what Siddharth is graduating in again within 10 months? Or was it just PC's ploy to skip Karan Johar's birthday bash tonight and conveniently not be in town. Hmmm…u00a0