The 50-year-old actor took to twitter to share the happy news and also sought blessings for his son.
"Hi .. Me and Pony are happy share with you this moment of joy in our life.. We had a lovely baby boy.. Today .. Bless him. Cheers," Prakash posted.
The actor married Poni in 2010 after his divorce from his first wife Lalitha Kumari in 2009. The former couple have two daughters.
Prakash is an actor, director, producer, distributor and works in five languages (Tamil, Telugu, Malayalam, Kannada and Hindi).