You beauty!

You beauty!

1. An exclamation of joy, pleasure, triumph, etc. Primarily heard in Australia, New Zealand. A: "Our new app has just been downloaded over one million times!" B: "You beauty! That's great news!"
2. An exclamation of affection, praise, or appreciation for someone. A: "I managed to get your computer working again." B: "Ah, you beauty—you're a lifesaver!" A: "Here's a video of me singing to my grandmother at her 90th birthday party." B: "You beauty, you've got me in tears watching this!"
Farlex Dictionary of Idioms.
See also:
  • a go (at someone or something)
  • have a go
  • have a go (at someone or something)
  • have a go at
  • have a go at someone
  • new kid on the block
  • a new kid on the block
  • a/the new kid on the block
  • accommodate (oneself) to (something)
  • accommodate oneself to