The mum-of-one had a relatively down-to-earth birthday bash weekend in New York City, sharing an Uber with her royal friend, to get about.
Their Uber driver, David Capellan chatted to E! News about the fun group, revealing the couples were both very humble and nice, and that they all had a great time chatting during their drive together.
In fact, David even scored a selfie with the smiling foursome.
According to the New York driver, the two couples laughed as they chatted about yachts! Fergie’s daughter even name dropped one of her favourite sailing experiences – her time on Oprah Winfrey’s MEGA yacht!
Of course Ashton and Mila were incredibly funny as they joked about their sea adventures!
"They were pretty hilarious," David recalled.
The proud-parents to baby Wyatt also continued their celebrations for Mila’s birthday with their little one.
People reported the family-of-three were spotted strolling with their daughter, around Manhattan's Upper West Side neighbourhood.
One onlooker told the entertainment magazine the parents grabbed some yoghurt while "Ashton was pushing the stroller and bouncing their baby, and Mila seemed cute and animated.”
Pass-byers watched on as they loved-up duo dropped into an American burger joint, Bareburger. The family appeared to be "really comfortable with each other," the onlooker told the magazine.
Mila and Ashton are one of our favourite Hollywood couples that have truly stood the test of time.
The mum-of-one admitted to W magazine that her fairytale was complete with Ashton.
"My first real kiss ever was with him on [That '70s Show]. We all get movie star crushes. I'm marrying mine," she quipped.
While Ashton couldn’t be happier, telling Conan O’Brein last year that fatherhood “is the greatest thing on Earth."
The father-of-one might soon become a dad-of-two with reports from Radar Online revealing the married couple want to expand their family!
“Mila has seen a fertility doctor who has told her that she is in perfect shape right now to become pregnant,” a source told the website.
The couple who welcomed Wyatt Isabelle in October 2014 are currently in wedded bliss as they tied the knot over the 4th of July weekend.
“Everyone danced and had a great time,” a source told E News, adding “there was also a casual farewell brunch on Sunday morning before everyone went home.”
One person who didn’t make the wedding was Ashton’s best friend and That 70’s Show co-star, Topher Grace.
Despite not making the big day due to work commitments in Australia, the actor has nothing but kind words for the newlyweds, telling E! News that Ashton and Mila are "the greatest."
“It's the greatest thing that ever happened," he gushed about his friends.
"It's like two of your great friends from high school got together after high school and had a baby. And they're such a lovely couple."
Before adding, "I love those guys. It's great to know they're together. You want to all stay together when you're on a show like that . . . They get to stay together forever."