Badgley Mischka Or Richard Tyler?

Hey brides-to-be! I am having my wedding in the winter and I don`t know which gown to wear. I got crazy and purchased 4 gowns (one`s a Carolina Herrera gown I`m donating for a charity auction and the Lazaro one`s listed on Ebay) and the 2 I`m keeping is the Badgley Mischka & Richard Tyler. Is it tacky for me to wear both in the same day of my wedding? I plan to wear RT for the ceremony, because it is more formal & cinderella like and reserve the BM for the reception - the Badgley gown is sexier & showy. I spoke to my sister & she told me to disregard the idea & to only wear one. She thinks it`s tacky to change into another gown. I on the other hand think it`s a great idea....plus these 2 gowns put together already cost my fiance spending over $11,000, not to mention the other two gowns my dad bought! I just can`t choose between the two, really!