Since Carrie Fisher's tragic death in December, Billie Lourd is doing her best to preserve her mother's memory. On Wednesday, the Scream Queens actress posted a sweet throwback photo of her and her mom sitting in the back of a limousine on Instagram. "✨😇✨," she captioned it. Billie also lost her grandmother Debbie Reynolds that same month, but thankfully, she's had the love and support of her family and friends to help her pull through.