wow...so fast to get the news! It's good to see someone else checks sanspo too. Here are some more details about the incident:
Ayu cried while singing "Voyage", as seen in the pics. She was also not wearing her
ring on her left hand ring finger. Nobody knows why she started crying (she didn't comment about it).
(news obtained from sanspo)
EDIT: correction about ring in bold. It better not be a "wedding" ring!