Brody Jenner is not only going to be a dad, but he's also going to be a husband!On Sunday, Jenner revealed that he proposed to his girlfriend, Tiarah «Tia» Blanco, while celebrating her baby shower over the weekend.In a video shared to Instagram, Jenner is seen addressing partygoers as cradles Blanco's growing bump. After thanking friends and family for attending the special affair, Jenner says he has one more thing to do before the shower officially comes to a close.