Nǐ jīntiān zhēn piàoliɑnɡ.
你今天真漂亮。
You're so beautiful today.
Notes:
你(nǐ): you
今天(jīntiān): today
真(zhēn): really
漂亮(piàoliɑnɡ): beautiful, pretty
Example:
A:你今天真漂亮。
Nǐ jīntiān zhēn piàoliɑnɡ.
You're so beautiful today.
B:谢谢。
Xièxie.
Thank you.