¿Estás hablando en serio?
Are you speaking seriously (which we would not say in English) is this closer to (Are you being serious? Or are you serious?) You love her don't you? ¿Estás hablando en serio? Are you being serious? Gracias?
2 Answers
Yes, jeez, that is it, altenatively:
¿VAs en serio?
¡¿No me digas?!
¿?No lo dirás en serio?!
Are you serious? is the closest translation.
Hope that helps!