Hiding behind Ashton's hat, the couple quickly kissed and looked adorably embarrassed in the process.
The former That 70's Show co-stars had been keeping their romance pretty quiet, but since Ashton's divorce with Demi Moore was finalized, they have been a little less shy about their love, with Ashton even sharing a photo of them kissing on his Twitter page.
Engagement rumors have been swirling around the lovebirds for awhile, and Mila was even spotted wearing a ring on her ring finger a few times, but so far, no official announcement has been made.
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Gallery | Celeb Couples: Which Lovebirds Will Last Longest?