Brad Pitt touched down at LAX this afternoon -- sans Angelina, sans Syrian baby ...

So there a few options here, we think -- 1) Angelina Jolie really WAS with Brad and she sneaked into a car upstairs at departures ... with a new addition to the family or 2) Angelina stayed back in Europe ... with or without a new addition to the family. But something sure seems fishy here. Where were these two all week and why were there no Brangelina sightings after they both departed LA last Sunday?

Pitt certainly looked happy, smiling at photographers as he made his way to a waiting car service. The extra security detail was missing and the actor looked relaxed and maybe relieved? Do YOU think Brad and Angelina have a new member of the family?