Looks a lot like....

Absolutely! Everytime I see the trailer for Sing Street, I think that he must be the younger brother of Chris Pratt.

That was exactly my thought! I'm watching delivery man which also has Chris Pratt in it, and I thought I'd missed a plot twist because they look so similar. Both gorgeous I might add!

With the shorter hair (it was longer in Sing Street, for those of you who haven't seen it -- but do if you can; it's a great film), I was thinking he looks like a thinner Seth Rogen. But I can see the resemblance to Chris Pratt too...

A young Seth Rogen?

In Sing Street all I could think of was he looks like a hybrid of Seth Rogan and Chris Pratt.