Will Arnett is excited that he and girlfriend Alessandra Brawn have welcomed a new addition to their family! As People mentions, the actor appeared on The Tonight Show Starring Jimmy Fallon on Thursday, where he talked about his new son, Alexander.

Arnett jokes about nickname for son: "The price hasn't been right"

Arnett and Brawn named their son Alexander Denison, but his nickname happens to be the same as the name of a popular restaurant! "We call him Denny," Arnett told Fallon. However, he clarified that Denny's wasn't his namesake! "I know what you're [gonna say] — not after the fast-food chain."

"Why not?!" Fallon asked, which prompted Arnett to then give a humorous reply! "Everybody who knows me knows that I'm a fan of the Grand Slam breakfast," Arnett said, joking about one of Denny's menu items. "The price hasn't been right... yet."

Will Arnett attends the FOX Winter TCA All Star Party on January 7, 2020.

Arnett's older sons "super psyched to be big brothers"

Arnett's son Denny is his first child with Brawn! However, he also shares two sons with his ex-wife Amy Poehler— 11-year-old Archibald "Archie" William Henderson, and 9-year-old Abel James. Arnett said that they're excited about Denny's arrival as well.

"They're super psyched to be big brothers, and it's been crazy," the LEGO Masters host revealed. "'Cause obviously the world is upside down right now, so it's been weird anyway." 

Arnett says having a new baby "is kinda like being in quarantine"

Arnett equated being a new parent again to the current circumstances of the world. "You know what it's like — those first few months of having a baby are kinda like being in quarantine anyway," he said to Fallon. "You're locked down."

"That's how I felt anyway, and then it's just been kinda double that, so it's been okay." As People shares, Arnett's rep confirmed Denny's arrival on June 12. "Denny is home and everyone is doing well," he said.