It's written all over your face.
Meaning: If you say "it's written all over your face", you're saying that the expression on someone's face is showing their true feelings or thoughts.
- I knew my son had stolen the money. The guilt was written all over his face.
- I can tell something amazing has happened. It's written all over your face. Tell me what it is!
Even if the joy of winning Wimbledon was written all over Rafael's face, Natalie couldn't tell because