And the rumours go on and on...Mariah Carey friend buys baby book, has it signed 'Dear Mariah, Congratulations'

Finally, some concrete evidence that Mariah Carey and husband Nick Cannon are expecting a little one!

One of the singer’s very good friends purchased a copy of Dr. Jenn Berman’s new book, "SuperBaby: 12 Ways to Give Your Child a Head Start in The 3 Three Years," at a book signing event at the upscale Little Seed baby boutique in Los Angeles on Wednesday.

“She went up to the author and said, ‘Please sign this for Mariah—and make sure it says, ‘Congratulations!” a witness told FOX411.com exclusively. “Dr. Berman smiled and wrote something like, ‘Dear Mariah, Congratulations! I hope this helps you through the first three years.’”

With solid advice on how to raise a healthy, happy baby—Mariah and Nick may soon have little superstar on their hands!

Carey was not immediately available for comment.

At an "America's Got Talent" event on Wednesday, Nick Cannon replied "Who knows?" when asked by US Weekly if Carey was pregnant.

Um, looks like her friend might.

Source:Foxnews