A new song off of Britney Spears' upcoming eighth studio album called "Alien" has leaked ahead of the release of "Britney Jean." The track, which was produced by William Orbit, has been teased by Spears for weeks. The 31-year-old singer voiced her excitement for "Alien" earlier, calling the song "really cool" and "really great." The leaked song, which was originally rumored to feature Lady Gaga, is reportedly not the finished track, as Orbit wrote on Twitter, "It's the wrong version of 'Alien' that's out there. Right song, but had wrong chorus notes, (now fixed) on THE version." Take a listen to the early cut below.