03/18/2010 05:12 am ET Updated May 25, 2011

Jessica Simpson 'Lost In Laughter' With Billy Corgan (PHOTOS)

Jessica Simpson is going public with her feelings for Billy Corgan, whom she has been rumored to be dating since last month.

The pair is at least collaborating on music. "I am blessed," "Listening to playback with my ethereal friend" and "Fun to be lost in laughter," Jessica tweeted while "going over a song w @billy and the boxer."

A source tells People that Jessica and Billy have been dating for four months now.

"He got her number and starting calling her," the source told the magazine. "He thought she was cute ... adorable ... and she got a little crush."

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