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Mila Kunis and Ashton Kutcher headed out to dinner in Los Angeles on Sunday evening, and the duo looked relaxed when we spotted them cruising around in Ashton's black SUV.

The previous weekend Mila rented out La Poubelle in Hollywood to celebrate Ashton's 36th birthday with a surprise party, and a source tells Us Weekly, "It was very small. Ashton has been going there for year and years. It's one of his favorite spots, like home, so it was comfortable and they were well taken care of. They had been planning it for awhile. Ashton didn't want a huge thing but they got a good group together. He's certainly changed from how he used to like to party years ago. This was more of a wholesome situation. They had a great time."

Wonder when they're going to get engaged though? Tick tock!