Speaking with British radio station Magic FM, 21-year-old Liam admitted the baby news was a shock even to him, but also said that 23-year-old Louis was "very excited" about becoming a parent with Los Angeles-based stylist Briana Jungwirth.
"Well I was, quite obviously, a bit shocked, you know," Liam acknowledged about finding out the surprising news. "But he's taken super well to it. And he's excited; he's very excited about what's going on with him at the moment."
"And sometimes stuff happens like that," he added. "And not [like] it's a small deal … You know, he's taking it very seriously, so it's all good."
As for his thoughts on Briana, Liam gave his seal of approval, calling her "a lovely girl."
Last month, a family source told ET that Briana is actually no longer in Los Angeles -- but her relocation may only be temporary as Louis is reportedly looking at properties in the L.A.-area. The two met earlier this year through friends.
"Louis is happy and very excited about becoming a dad and he thinks Briana will be an amazing mother," a mutual friend of the couple also told ET. "It was a surprise at first, but he and Briana are very, very close friends and this has brought them even closer."