Oprah Winfrey received so much birthday love that she sustained an injury! While celebrating her 59th birthday on Tuesday, the OWN honcho received a massive flower delivery from her pal Tyler Perry. However, while moving it to the perfect spot in her Montecito, California, mansion – which was inundated with beautiful bouquets and gifts from friends – she suffered a back injury that has left her down for the count. Responding to a fan’s tweet about how she spent her birthday, Oprah tweeted, “In bed with an ice pack most of today. Moved a bushel of…