No, it's not Rosie.

It's a big fat pulsar:

The astronomers think the pulsar may once have been part of a triple system of stars and was ’spun-up‘ by its closest companion star – which was either ejected from the system or worn away after it transferred all its mass to the pulsar – and now remains in an elongated orbit around the third, more distant member of the original trio.
http://www.physorg.com/news130153186.html

Oh yeah, this article is kinda dirty too because it talks about the sex life of stars.