Nicolette Sheridan is reportedly pregnant with her first child.The 'Desperate Housewives' star - who is engaged to singer Michael Bolton - is thrilled after discovering she is expecting.A show source said: "She's absolutely glowing and her pregnancy is the buzz of the set."The 43-year-old actress has been asking her co-stars Marcia Cross and Felicity Hoffman for advice on pregnancy and motherhood.The source added: "She kept asking Felicity and Marcia about how the pregnancy would change her appearance and if it would make her hair thinner."Nicolette - who got engaged to Michael in March 2006 - recently revealed her desire to become a mother, even though she has a hectic lifestyle.She said: "I don't know how I'd have time to deal with it, but being a mom is so special. Of course, if it happened, I would just make time!"

Michael, 53, already has three daughters from his marriage to Maureen McGuire.

Nicolette and Michael first dated in the 90s and rekindled their romance in 2005.

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