French translation: D'accord, tu m'as découvert(e)! (familiar form)
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Explanation: If you want the formal, or plural form, D'accord, vous m'avez découvert(e)!
You need to add the "e" at the end of the word "découvert" if it's a girl who is speaking.
I think this is closer to the sense that you are asking for, finding out about something that others didn't know you could do. Colin's suggestion is more in the context of catching someonethat wanted to hide something from others.