'New Daddy' Justin Timberlake marks Father's day, posts pics with newborn

Seems like this Father's day was somewhat more special for Justin Timberlake as he celebrated it with his 11-week-old son Silas.

The 34-year-old singer, who welcomed his first baby with wife Jessica Biel in April, took to Instagram to document his special holiday, reported Us magazine.

The 'Mirrors' hit-maker took a snapshot with his son wherein "I Love Dad" was embroidered on his newborn's blue onesie.

Timberlake captioned the picture, "FLEXIN' on Father's Day.