The actors will endorse two new variants - Lux Peach and Cream, and Lux Strawberry and Cream - in their first ever endorsement together, said a statement.
The ad will go on air on Diwali, Nov 13, the same day when JTHJ hits the screens.
This time, the Bollywood Badshah will feature as a 'bekaboo' (uncontrollable) with Katrina. In the ad, fragrance of the soap drives Shah Rukh 'bekaboo'.
"I'm happy to be associated with Lux yet again! The fragrance of Lux will captivate you just as it has made me 'bekaboo'. The fragrance of Lux that stands for love and sensuality brings out the lover in me," Shah Rukh said at the shoot.
The commercial is shot and directed by French director Juan Delcan. It's Sufi-inspired music score has been composed by acclaimed poet and lyricist Gulzar, and sung by Sonu Nigam.
Katrina's look in the ad is styled by fashion designer Rocky S.
"When I think of Lux, I think of fun and spontaneity. Lux embodies a type of a woman rather than just soap and of course the fragrance that embodies sensuality," said the actress.