Katy Perry brought her own Grammy to Sunday's award show — her 90-year-old grandmother, who wore Armani and walked with a blinged-out cane (a birthday gift from Katy). The newly married pop star also revealed that her husband, career goofball Russell Brand, is "absolutely a romantic." What's their secret?
Plus: See what Perry thought of Lea Michele's rendition of "Firework" on Glee.
Watch the full interview after the jump.