Britney Spears and Jason Trawick Do Sydney

Britney Spears and Jason Trawick, her agent and boyfriend of several months, may not be engaged yet, despite the marriage rumors that persistently pop up.

But they certainly look the part of the family unit.

The couple and Britney's two sons, Sean Preston Federline and Jayden James Federline, looked happy as can be as they strolled through a park on Saturday.

It was a tender family moment ... just Britney Spears, Jason Trawick, her two sons and massive amounts of security following them around Sydney, Australia.

Still, life is good for Britney and family ...

Britney Spears and family out and about.

Don't think for a second, though, that the singer's handler wasn't observing her every move. Also along for the stroll was Britney's father, Jamie Spears.

Gotta keep your eyes on the cash register at all times, after all.