The "Highway" actress says she has fond memories of her mother giving her an oil massage.
"Garnier is one of the first brands that I signed on. For the first time, I have got to team up with my mom, and do an ad along with her," Alia told IANS over phone from Mumbai.
While she is glad that she got a rare chance to work on screen with her mother, Alia pointed out: "The reason I believe they thought of bringing my mom and me together is because you know, when you think of oiling your hair, it always takes you back to the days when you were young, and your mother would put oil in your hair.
"So, because this product is the new generation's oil, this time the tables have turned, wherein I'm suggesting what product to use to my mom."
Her mother Soni Razdan, an actress and director, says the ad with her daughter is "the best comeback for me".
"Being a mother to a leading actress and being an actor myself, I always wanted to work with Alia. We share a fun equation and shooting for Garnier Fructis Oil-In-Cream was a great and memorable experience," she said in a statement.
It was Alia and Soni's "chemistry" that drew the creative minds behind the ad to rope them in.
"Their chemistry was great as they bonded like any mother-daughter would when it comes to oiling one's hair -- a practice that every mother teaches her daughter," said Rupika Raman, general manager, Garnier India, adding that the duo turned out to be a "perfect fit".