Getty / Instagram @britneyspears

Britney Spears has returned to Instagram -- and is offering followers advice on setting boundaries alongside a photo of herself in lacy lingerie.

Check out her post from Friday night ... the Princess of Pop posted what appears to be a screenshot from a video that shows her posing in a black and nude lingerie set. Instagram / @britneyspears

In the caption, she tells fans she's really into the faith-based self-help book "Draw the Circle", which she says gives an "incredible perspective" about how to live within your means. Instagram / @britneyspears

She adds ... "Get your ballerina 🩰, circle, and own your boundaries. It’s incredibly strict and somewhat of a form of prayer but with so many endless possibilities in life, it’s important to do

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