Ali Larter  Byron & Tracey  sweater no bra jean boots

Ali Larter looked low-key but lovely as she left the Byron & Tracey salon in Beverly Hills on on Tuesday.

The actress and new mom cut off her long, blonde locks in favor of a more parental, bob-style cut!

And, she must be a busy mommy -- she didn't even have time for a blow dry ... or a bra!

Ali gave birth to son Theo in December.