Vivek Oberoi is not in Swayamwar 3
A source close to Oberoi told hindustantimes.com that, "Vivek hasn’t been approached by the production house and even if he were he won't do it. He'll never make nautanki out of the institution of marriage."
This is the most direct denial of this rumour doing the rounds. Vivek indirectly denied the news on Twitter without getting too direct, he'd tweeted, “Issey kehte hain "begaani shaadi mein bin bulaye baaraati.”
One does wonder whether a guy of Vivek's caliber needs these gimmicks in his life to get attention.