Simpson, who wed Eric Johnson on July 5 in a romantic celebration in Montecito, California, enjoyed a brief honeymoon in Mexico.
"They decided to go last-minute," a source tells PEOPLE.
But while she had a relaxing time in the sun, the new Mrs. Johnson clearly missed her children, Maxwell, 2, and Ace, 1, who'd stolen the show at her wedding.
"My kids got standing ovations," the proud mom, 33, told PEOPLE after the wedding.
Posting a photo of her blond-haired cuties on Instagram on Wednesday, she wrote, "There is no way these kids could be more adorable. OMG! So happy to be home snuggling!"
Reporting by MICHELLE TAN