world champion behaviour

[Hanka]

Hello,

could you please help me? In my native language we say "he behaves like a world champion" (meaning proud behaviour). Do you use it the same way, like "world champion behaviour" or "he behaves like a world champion" or do you have a different expression?

Thank you very much.

Hanka

[GMBSNB]

"He behaves like a champ"