Justin Timberlake (R) and Jessica Biel.Photo: Justin Timberlake/Instagram

Jessica Biel Justin Timberlake

Justin TimberlakeandJessica Bielare in “Heaven” with their two boys.

“They are spending time together as a family in both Montana and Los Angeles,” says the source. “They seem happy.”

After months of keeping the details of Phineas' arrival under wraps — even after palsLance BassandJimmy Fallonlet the news slip last year — Timberlake opened up about him for the first time during an appearance onTheEllen DeGeneresShowon Monday.

“He’s awesome and so cute,” Timberlake told the host. “Nobody’s sleeping, but we’re thrilled. We’re thrilled and couldn’t be happier. Very grateful.”

Timberlake said DeGeneres, 62, was among the few “outside of the immediate family” who knew about Biel’s pregnancy.

When asked how parenting two kids compares to one, Timberlake joked, “We don’t see each other anymore,” adding, “It’s a lot of fun. I guess the saying goes go from a zone defense to a man-to-man really quickly. It’s great. Silas is super excited.”

As to how Silas has been adjusting to life as a big brother, Timberlake said that “right now, he’s very much liking it.”

“Phin can’t walk yet or chase him down,” he said, “so we’ll see what happens.”

RELATED VIDEO:Justin TimberlakeAnswers Kids' Questions—and Reveals His Favorite Childhood Toy He Carried Everywhere

In addition to being an older sibling, Silas is getting really into video games.

“He’s into Legos and tennis,” Timberlake said. “We got him a Nintendo Switch. It’s just like, child crack.”

He’s also enjoying golf like his dad.

“He likes golf, but I’m not pressing it,” Timberlake said. “I want him to like it if he likes it. He’s fast and active so he’s very good at tennis.”

For all the details onJustin TimberlakeandJessica Biel’s new life as a family of four, pick up the latest issue ofPEOPLE, on newsstands Friday.

source: people.com