And here's the thing: What she tells them may surprise you.

Busy Philipps is known for keeping it pretty real on Instagram. A day in the life of the mom of Birdie, 9, and Cricket, 4 (her daughters with her screenwriter husband Marc Silverstein) might include a behind-the-scenes look at a glamorous cover shoot or a total breakdown over accidentally leaving behind her daughter’s teddy bear on vacation. You never know, and that's part of the appeal of Phillips.

Recently, we caught up with her at a Three Olives Rosé Vodka event and Phillips revealed that she's teaching her daughters all about self-confidence right now—which also happens to be the theme of her new movie I Feel Pretty, which Silverstein co-wrote and directed. And, it turns out that what she's telling them is pretty great.

“My mom used to say to me the Shakespeare line from Hamlet, ‘This above all: to thine own self be true,’” she told RealSimple.com. “She said it to me so much that it permeated my being. I hope that I’m able to instill the same thing in my girls. I want them to be true to themselves and what they feel and believe and what they want.”