Louis Tomlinson is already enjoying fatherhood.
Just one day after the One Direction member and Briana Jungwirth welcomed their son, the first-time father took to Twitter to share the exciting news with his 21.3 million fans.
"I'm pleased to say my baby son was born yesterday :)," he confirmed in a tweet that was retweeted by the 1D Twitter account. "He is healthy and pretty amazing :) I'm very happy!!"
I'm pleased to say my baby son was born yesterday :) 👶 He is healthy and pretty amazing :) I'm very happy!!— Louis Tomlinson (@Louis_Tomlinson) January 23, 2016
A few moments later, he posted a message that read, "Daddy daddy cool," which was followed up with another tweet of three typed-out smiley faces.
Tomlinson's stepfather, Mark Tomlinson, broke the news of the baby's arrival on Twitter, writing, "Is that the patter of tiny feet?"
"Louis is happy and very excited about becoming a dad and he thinks Briana will be an amazing mother," the source revealed. "It was a surprise at first, but he and Briana are very, very close friends and this has brought them even closer."
As ET previously reported, the "Perfect" singer and Jungwirth -- a stylist in Los Angeles -- were briefly linked back in May, just one month after Tomlinson split from his longtime girlfriend, Eleanor Calder. In December, Tomlinson sparked romance rumors with another girl, The Originals star Danielle Campbell, after they were spotted out together in Chicago.
To hear more on Tomlinson's little bundle of joy, watch the video below.