speak of the devil
US /spiːk əv ðə ˈdɛvəl/
UK /spiːk əv ðə ˈdɛvəl/

1.
hablando del rey de Roma
said when a person you have just been talking about unexpectedly appears
:
•
We were just talking about Tom, and speak of the devil, here he comes!
Estábamos hablando de Tom, y hablando del rey de Roma, ¡aquí viene!
•
Oh, speak of the devil, there's Sarah walking towards us.
Oh, hablando del rey de Roma, ahí viene Sarah caminando hacia nosotros.