Today it's my treat.  今天我请客。

=It's on me today. 

=I'll get this one

=Allow me.

Dialogue

L: Honey, let's go for dinner. Today it's my treat!   亲爱的，我们去吃晚餐，今天我请客！

D: Yay, that never happens! 好赞，天下红雨了！

L: @#$$%#^ 找死啊！

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