Mila Kunis and her main squeeze Ashton Kutcher spent a romantic day together in Australia on Friday.

The couple traveled down under for a business trip for Kutcher, who was in Sydney, Australia, to host a star-studded dinner event in celebration of his successful business venture Airbnb, an online service that matches users to their ideal vacation rental.

Kunis and Kutcher held hands and looked to be enjoyed spending time with one another as they strolled around Sydney's scenic coastline.

CLICK HERE to check out photos of Mila Kunis and Ashton Kutcher spending time together and engaging in some casual PDA in Sydney, Australia.

Before the Airbnb dinner, which was also attended by Spice Girl Mel B and "Australia's Got Talent" host Brian McFadden, Kutcher and Kunis also took in a trip to the Wild Life Sydney Zoo.

A source told Australia's Daily Telegraph that the couple's visit went off without a hitch and they seemed to love being in the country.

"They never requested anything and just enjoyed a typical experience. It was just the two of them, and while they didn't want any photos taken, they were very pleasant and friendly," the source said.

Kunis was recently honored with the title of the "Sexiest Woman Alive" by Esquire Magazine. In the accompanying profile, Kunis said she appreciated the ranking, but she didn't want it to go to her head.

"So much of who you are in this industry is based on what that critic says, what that director says, what that actor says. People start believing all that, and they become what everybody else wants them to be," Kunis said. "And I think that I've consciously separated my two lives. I love what I do. I couldn't imagine doing anything else. But when I'm done with work, I'm done with work. I think that if I bought into the hype, I would lose all sight of who I am."