Ashlee Simpson isn't just a mom now—she's also an aunt!

And though Jessica Simpson's got a few years on her, Ashlee's son Bronx is 3 and a half, so she's the expert when it comes to motherhood.

So, has Jessica been seeking parenting advice from her kid sister when it comes to her baby daughter, Maxwell?

"No, Jessica's got this down," Ashlee dished to E! News at the Missoni Havaianas Collection launch at Kitson in Los Angeles. "She's doing good. Once you become a mother, you've got it down...It's fun to be around them."

And, better yet, Bronx loves being a "big cousin!"

"He's excited to teach her all his new things—when she's ready," Ashlee laughed. "He's like, 'Wait a second, I'll wait till she can talk,' or 'I'm going to teach her how to talk.' Little things that you think you can do as a child—all the things my big sister taught me."

—Reporting by Will Marfuggi and Katie Rhames

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