Britney Spears and her fiancé, Sam Asghari, have a new member of the family.Porsha is the newest member of Britney Spears and Sam Asghari's family.The pop icon shared a video on Instagram taken alongside her fiancé posting with her gorgeous diamond ring, writing in the caption, "can’t f--king believe it 💍💍💍💍💍💍❣️!!!!!!".