April 19, 2015 08:45 PM

Jonathan Leibson/WireImage

Could he be any cuter?

Justin Timberlake shared the sweetest pic on Instagram of his first child with Jessica Biel — son Silas Randall — on Sunday.

“The Timberlakes are ready!! GO GRIZZ!” the proud papa captioned the photo, which showed Biel cradling her son, who’s dressed in a Memphis Grizzlies shirt.

The Grizzlies were playing the Portland Trail Blazers on Sunday in the first-round NBA playoff series, and there’s no prizes for guessing where the Tennessee-born singer’s loyalties lie.

Silas was born earlier this month. His first name is the middle name of Timberlake’s maternal grandfather Bill Bomas, who died in 2012, while Randall is Timberlake’s father’s name and also the singer’s middle name.

Following their son’s birth, the couple’s reps told PEOPLE that the new dad was “ecstatic” about his bundle of joy.

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— K.C. Blumm

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