Look at you, all grown up!

Meaning

A warm, often nostalgic comment made by an adult when seeing a child or young person after a long time. It expresses surprise at how much they have matured.

Warm, sentimental

Used in a sentence

• Wow, look at you, all grown up and heading off to college!
• Look at you, all grown up with a job and an apartment.
• I haven't seen you since you were five, look at you, all grown up!