The 30-year-old dad posted a snap on Instagram while he and three-month-old Buddy waited for their muffins to bake.
With Buddy sat on Fletcher's lap staring into the oven, the resemblance to his two-year-old brother Buzz is obvious - and adorable.
Just to compare, here's Buzz when he was a baby nearly two years ago.
Not long after Fletcher posted the father-son snap, his wife Giovanna Fletcher gave us a peek into the result of their patient waiting.
"Daddy and Buddy baking session, mummy and Buzz eating session," she wrote. "Banana muffins - delicious."
The celebrity couple, who welcomed their second son in February 2016, often post photos of their younger son, but rarely show his face.