It was on the first day of her job as the co-host of Bravo’s upcoming new reality show Going Platinum that Jewel received the happy news, according to PEOPLE.

“I took a pregnancy test and it was positive!” the singer, 36, tells PEOPLE. “It was so hard to keep it a secret. I was worried I’d start throwing up on set and everyone would be like, ‘Oh, she’s pregnant.’ ”

Now in her second trimester, Jewel and her husband, rodeo star Ty Murray, are finally ready to share their happy news.

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Just two months after leaving American Idol (or being asked not to return), Kara DioGuardi is heading back to the judging table as the lead judge on Going Platinum, a new song-writing competition on Bravo. More from PEOPLE:

“Hit songs are the backbone of the music industry, and as a publisher, nothing excites me more than finding new songwriting talent,” DioGuardi says. “I am happy to be a part of a show that helps up and coming songwriters pursue their dreams, while giving the public a look into the creative process.”

Jewel will host the show and help judge the competition, along with a music executive and celebrity guests. Going Platinum starts taping this month and will premiere in 2011.

The show will follow 12 musicians as they write music and lyrics for different genres, from hip-hop to love songs to dance tracks. The winner will receive a $100,000 prize, as well as music-publishing and recording deals.

A source familiar with the show says it’s a good fit for DioGuardi because “at heart, she’s a songwriter. Idol was performance-driven. This isn’t just about finding the next big singer – it’s about finding a hit maker, and she loves to nurture talent.”