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Here comes the bridesmaid!
The brunette beauty donned a pale pink strapless dress with silver strappy heels and wore her long locks down. She also held a gorgeous bouquet of white flowers.
The Two and a Half Men star looked dapper in a tuxedo and bowtie.
Kunis was spotted with a simple gold band on that finger, but eventually moved it to her right hand.
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Ashton Kutcher and Mila Kunis Attend Her Brother's Wedding: The Black Swan actress appeared to be "very happy" for her brother and his new wife, a source revealed to E! News.
"During the ceremony, she stood at the altar and seemed very focused on the vows," the source said.
Kutcher was supportive of his ladylove and Kunis was seen making eye contact with him during the ceremony.
"He was joking around with Mila's brother and they invited him to come and pose for family pictures with the bride and groom after the wedding," the source continued. The source added the couple looked "totally in love and inseparable."