Jessica Simpson's lil' sis, Ashlee, best known for her lip syncin' fiasco, has officially announced her engagement to Fall Out Boy's bassist Pete Wentz.

After weeks of rumors, innuendo and sheer speculation the couple broke the news on the web — natch.

"Pete and I wanted our fans to be the first to know," the Ash said. "Yes, we are thrilled to share that we are happily engaged."

The couple has been dating for over two years.

Rumors are already buzzing the betrothed rockers had good reason to go public.

In a matter of months that truth may be self-evident.