Mila Kunis of course brought boyfriend Ashton Kutcher as her date to brother Michael Kunis' wedding on Dec. 7, 2013, in St. Petersburg, Fla.
As engagement rumors swirl around the couple, they take a test run as bridesmaid and usher.
The ceremony was at the Cathedral Church of St. Peter in downtown St. Petersburg.
Mila switched the plain gold band she's been wearing on her left hand for her right before the ceremony.
Think of the wedding pictures these two would take!
NEXT GALLERY: Ashton Kutcher & Mila Kunis: PDA in NYC