Identification: what kind of flower is this?

We had this plant as a gift. We didn't know it has flower and all a sudden it bloomed. Can anyone give me some information on this flower. Thanks

 

Epiphyllum oxypetalum may be?

 

Yes. Tyrlych is right.

 

Another example of how amazing the internet is! San Francisco, Kiev, and Virar all connecting. Marvellous!

 

Thanks so much. =)