Brittany Cartwright is glowing with her new man Brandon Hanson , making it crystal clear -- it’s a whole mood compared to her estranged ex, Jax Taylor !

We spotted Brittany outside Casitas in L.A., and she set the record straight ... Brandon ain’t official yet, and she’s not calling herself his GF. Not yet. Gallery Launch Gallery

Still, Brittany says it’s all about fun for now, Brandon’s making her happy -- and you have to watch the full video, 'cause she also spills on when they might make it official.

And while Brittany still smiles talking co-parenting with Jax, it’s clear it’s not all smooth sailing -- she admits there are plenty of ups and downs. Gallery Launch Gallery Getty

Catch the full clip -- Brittany’s demeanor says it all... the split with Jax is still bi

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