Today is Chris Brown's 27th birthday and he's celebrating by releasing a brand new track. "Grass Ain't Greener" serves as the lead single for Breezy's upcoming album "Heartbreak On A Full Moon." The production is a bit 808 heavy and has more of a hip hop sound than r&b. Towards the end Chris Brown really shows off his rapping skills as he rifles off his lyrics. Take a listen to "Grass Ain't Greener" above!