Sandra Bullock is officially on Instagram! And she's already getting spicy! The iconic actress broke her social media silence on Tuesday when she officially signed up for the photo sharing app - a VERY welcome sight for fans and friends! In less than 24 hours, the Miss Congeniality star has racked up more than 4.4 MILLION followers! In her first post, Sandy shared a candid video of herself mixing margaritas, which she captioned: "Midnight somewhere...