Britney Spears toddler boys shocked shoppers at a swank Los Angeles boutique last week by showing off their impressive potty mouths for all to hear.

Sean Preston, 3, and Jayden James, 2, were repeatedly heard shouting “Oh shit!” as their pop star mama leisurely browsed through the racks, according to reports.

“We were all surprised by their potty mouths, but it was actually pretty funny,” says an onlooker.

Did Britney serve her sons with a harst tongue-lashing for their foul-mouthed rant?

“She was too busy picking out freebies to chastise the boys for misbehaving.”