It looks like Mila Kunis is quite the romantic girlfriend as she decided to throw her boyfriend Ashton Kutcher a surprise party for his 36th birthday on Saturday night. The intimate bash was held at La Poubelle restaurant in Hollywood.

According to Us Weekly, a source revealed, "It was very small. Ashton has been going there for year and years," adding, "It's one of his favorite spots, like home, so it was comfortable and they were well taken care of."

The "Two and a Half Men" star clearly has well off friends as his pals helped to rent out the eatery for the night.

The insider admitted, "They had been planning it for awhile. Ashton didn't want a huge thing but they got a good group together," adding, "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."

An onlooker who spotted Ashton Kutcher and Mila Kunis said that the couple who has been dating for nearly two years "looked romantic together" as they enjoyed a T-bone steak, shells and cheese with lobster, quail, braised rib and short rib while dinning at the French bistro.

The group clearly enjoyed the environment as they downed several drinks and made "great conversation." An insider explained, "Mila gets along great with all of his friends," adding, "She's like part of the crew."

The 30-year-old seems to be enjoying life with her beau as rumors continue to swirl that the "That '70s Show" couple is headed for an engagement any day now.

A friend of the couple said, "They talk about getting married and having kids," adding, "An engagement is imminent."