WhatsApp CEO Jan Koum turned 38 yesterday. PacificNews and TMZ spied him celebrating the event — and his $19 billion acquisition — in Spain with a friend.*

Koum went to Spain for the Mobile World Congress conference in Barcelona, so it's not some big surprise trip. Fun fact: Koum founded WhatsApp on his birthday so yesterday the company turned five.

The DailyMail says Koum spent the evening at a restaurant, Boujis, with Facebook CEO Mark Zuckerberg and wife Priscilla Chan. Korean singer Psy was also there.

Here's Koum on his birthday, below.

And here's a screengrab of the party from DailyMail:

*The intial version of this article stated what TMZ reported, that this is Koum's girlfriend. We've toned it down because it's not clear what TMZ's sources are for claiming that. 

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