It seems that last time it was only Jolin's sister engagement party and not her wedding. Her wedding is today in a big hotel. Jolin posted a picture of her in her bridesmaid dress:
美人計 will be revealed on Hit FM, between 9 & 12 a.m next Wednesday!!!
It seems that you can listen to this radio live thanks to this page (I will be asleep at that time XD):
http://www.hitoradio.com/showtime/onair_2.php