#justlookinforpearl @mrslisao

A photo posted by Hilary Duff (@hilaryduff) on Mar 25, 2015 at 3:46pm PDT

The world is his oyster! Hilary Duff shared a new photo of her 3-year-old son Luca Comrie having a barefoot adventure outdoors on Wednesday, Mar. 25. The only person missing from little Luca's excursion was his celebrity soul mate Pearl Osbourne.

"#justlookinforpearl," Duff, 27, wrote alongside the snap of her son walking along a pathway and rocking a shirt that read: "Sup, Girl." The proud mom tagged Jack Osbourne's pregnant wife Lisa in the pic.

Duff and Lisa have been friends for many years, even taking their kids to the same Hollywood baby class back in 2013. Last month, both moms shared photos of Luca and Pearl enjoying "an ice cream date" together.

Just last weekend, Duff and her estranged husband Mike Comrie celebrated their son's 3rd birthday. Duff filed for divorce last month from Comrie after one year of separation. As the Disney Channel alum detailed in the April 2015 issue of Cosmopolitan, however, the two remain amicable.

"Mike and I were very in love when we met," Duff shared. "We both really wanted to get married... Maybe it wasn't [the best decision], but we spent the majority of our time together really happy."

The Younger actress, who had Luca at age 24, opened up to TIME magazine this week about portraying a twentysomething in her new TV Land series.

"Sometimes I’m reading the script and I’m like, what? People do that? I am in my 20s, but I have a lot of responsibility in my life," she shared. "It’s just a balancing act of trying to have two careers that take up a lot of my time. And also being a mom — the most important one for me," she continued.