The star will be wearing a KJo-designed outfit for his nephew Imran Khan's wedding with Avantika Malik. "Karan has designed clothes for Aamir and his son Junaid. He has designed a traditional as well as a formal suit for the wedding functions," said a source.

Not just Aamir, the filmmaker has also been acting as a mentor to the bride-to-be, Avantika Malik. Karan has helped Avantika plan the entire wedding from clothes, jewelry, make-up to card designs.

However, for the mehandi celebrations Saturday, Imran and Avantika will be wearing designer Varun Bahl and Manish Malhotra's clothes. The wedding will take place Jan 10. Cooks are being flown from Lucknow to prepare traditional non-vegetarian dishes.

"For the wedding, cooks are being specially flying down from Lucknow. These are specialists and have been cooking for the family (Nassir Hussain's) for more than five decades. This is a traditional family of cooks having a more than 200 year-old lineage," said a source close to the family.

"They are even bringing the ingredients from Lucknow. All spices, vessels and other ingredients are being flown as they are very particular," added the source.