And just like their famous parents, the blonde youngsters were undeniably photogenic.
'Cool Cousins #BX #MAXIDREW,' Jessica captioned the photo, in which the pair smiled for the camera before digging into their frozen treats.
Before sauntering down the aisle with the dashing former American football player, she'd spent 2006 until 2006 married to 98 Degrees frontman Nick Lachey.
Meanwhile, Ashlee had Bronx, now eight, by her first husband Pete Wentz, who is himself the frontman of Fall Out Boy.
The Twilight star flaunted her flat tummy in a tiny cropped top, worn with ripped black jeans, and Vans shoes.
Showing off her newly-shorn and bleached hairstyle while on a walk, she made sure to stay hydrated in the Big Easy. The couple, who are rumored to have been dating since December, already appear to be dressing in tune.
Shoot, as long as he hurries up and puts out new music, I don’t care what or who he might be doing at this point…
While hosting Saturday Night Live in February, Kristen came out as 'like, so gay,' after years of speculation.
Jessica Simpson posted a sweet Instagram photo on Monday of her four-year-old daughter Maxwell Johnson posing up a storm with her sister Ashlee's son Bronx Wentz.
The pair did their best 'cheese' faces as they enjoyed a Baskin-Robbins ice cream.
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And while the twosome didn't spend an extensive amount of time hanging out together at the bash, they did greet each other. A source dished to pals, Bob and Tobly Mc Smith, who were also responsible for creating 90210! If you're interested in catching this musical, we suggest you snag your tixs well in advance. Well, in the past, the stars from the TV shows the Mc Smiths parodied have popped up in the audience.