"To my fans n friends from d media, I will be getting engaged to Varun on the 23 of January in a very private ceremony between our families", Trisha wrote on her micro-blogging site.
Manian runs production firm Radiance Media Group which produced the Tamil movies 'Vaayai Moodi Pesavum' and 'Kavviya Thalaivan.' Besides, Manian also runs Radiance Realty.
Trisha was earlier reported to be dating Telugu actor Rana Daggubati. About her marriage with Manian, Trisha said, "Please don't speculate about my wedding date as we have not fixed it as yet. And as always you will hear it from me first when we do."
On whether she would quit the film industry post marriage, Trisha said, "I have no intentions of quitting films. In fact I will be signing two new films soon and looking forward to four of my releases in 2015."
Trisha's latest film is with Ajith Kumar 'Yennai Arindhaal' and it is scheduled to hit screens soon.