Ashlee Simpson Shares Rare Photo of Her Gorgeous Kids -- See How Grown Up Bronx Is!

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Is that you, Bronx?

Ashlee Simpson graced us with a very rare photo of her two children, 7-year-old Bronx and 9-month-old Jagger, in celebration of Mother's Day.

WATCH: Jessica Simpson's Son Ace Adorably Cradles His Cousin Jagger

"THESE 2 are making me feel real special today!" she wrote on Sunday. "Loving MOTHERS DAY. Happy Mother's Day to all you MoMs."

Not only is it the first photo we've seen of both of her adorable offspring in quite some time, we can't get over just how much Bronx looks like his dad, Ashlee's ex-husband, Pete Wentz.

While her big sister, Jessica Simpson, posts photos of her two kids, 4-year-old Maxwell and 2-year-old Ace, on a near-daily basis, Ashlee has taken a far more private approach to social media. In fact, she wiped her Instagram slate clean last year, deleting all of her posts just before welcoming Jagger in July.

WATCH: Evan Ross Is Head Over Heels for Wife Ashlee and Daughter Jagger

The 31-year-old mom-of-two has given us a few peeks at her little girl, however. She and husband Evan Ross waited two months to share the first photo of their daughter, a precious shot that showed the whole family dressed in white, with little Jagger looking picture perfect in a tutu.

Ashlee also gushed over her baby girl in an Instagram shared one month later in October, with Jagger looking up pensively as she relaxed on a gray-and-pink carpet. "Yessssss!!! Baby we did this. Look at our lovely daughter.!!" she exclaimed. "#jaggersnowross❤️ She is LOVE pure love!! @realevanross."

And the proud mom did give us this close-up on Jan. 31, writing, "Sunday love."

RELATED: Ashlee Simpson and Evan Ross' Family Photos Are Too Cute for Words

Can you believe those incredible eyelashes?!

The "Outta My Head" singer married Evan in July 2014. She was previously married to Bronx's dad, Pete, from 2008 to 2011.

Ashlee was far from the only mom who proudly shared her love on Mother's Day. Find out which other celebrities gave shout-outs to their kids in the video below.