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We first heard rumours of the new addition to the Timberlake family in September last year, when Justin's former NSYNC bandmate Lance Bass confirmed to Entertainment Tonight that the couple had welcomed a second baby.
.@JTimberlake told me the name of his new baby! Don't miss the full interview on my show tomorrow. pic.twitter.com/grBQ9sls0S
- Ellen DeGeneres (@TheEllenShow) January 18, 2021
However, the couple had never confirmed the news themselves, or spoken on the baby.
Now, during his virtual appearance on The Ellen DeGeneres Show, which will air on Monday, Justin has reportedly confirmed the arrival of their second son for the first time, and revealed his adorable name - Phineas.
He said: "He's awesome and so cute. Nobody's sleeping.
"But we're thrilled. We're thrilled and couldn't be happier. Very grateful," added the 4 Minutes singer.
Justin and Jessica welcomed their first son, Silas, in April 2015 after they got married in 2012.
During the interview Justin revealed they kept the pregnancy a secret apart from immediate family, though he admitted Ellen was one of the few that knew about it.
Ellen said: "I think we were FaceTiming and you said, 'Hey, you want to know a secret? And then Jessica walked in and you put your hand on her stomach. You were like, 'I'm having another baby!;"
Ellen then asked Justin what it was like being a parent to two children.
Justin joked: "We don't see each other anymore.
Justin spoke about how five-year-old Silas is getting used to his new role as a big brother to baby Phineas.
"Right now he's very much liking it," Justin said. "Phin can't walk yet or chase hm down, so we'll see what happens."
Justin also revealed Silas is starting to enjoy video games as well as tennis.
He said: "He's into Legos and tennis. We got him a Nintendo Switch. It's just like, child crack."
Congratulations to Justin and Jessica!
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