She is my cup of tea.
她是我的心上人。

Scene
Jill: I've never seen Ben's girlfriend.
Cathy: His cup of tea is abroad.

Notes
one's (a) cup of tea，跟a piece of cake一样，并不是指一杯茶，而是指某人的一种爱好，喜欢的人或物，与favorite相似。如： Icecream is my cup of tea. So who is your cup of tea? ^_^

Exercises
表示爱人或喜欢的人，除了girlfriend / boyfriend, wife / husband,你还想到了几个词儿？：）