Answer: Mr. Hall and Miss Geist
The scene first implied that it was Cher and Josh getting married, but then Cher said, "As if! I'm only 16 and this is California, not Kentucky!" It was then shown that she and the rest of the gang were at Mr. Hall and Miss Geist's wedding. Cher was with Josh, Dionne was with Murray, of course, and Tai was happy with Travis. The girls all competed in the bouquet catching, and Cher emerged victorious. She and Josh kissed and the movie ended.