The starry couple, who co-star in new movie Bobby, sparked romance rumors when they attended a string of events together, but refused to confirm their relationship.
But now 48-year-old Stone and her 37-year-old beau aren't hiding their affections for each other--they recently attended a party for fashion label Dolce & Gabbana at the Chateau Marmont Hotel in Los Angeles arm-in-arm and made sure everyone knew they were a couple.
A source close to Stone says, "They're both really happy--but they don't have long-term expectations.
"It's a fun fling for the holidays and Sharon is a good influence. She rarely drinks and has three kids. It's a good match for now."
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