"It's Luciana – but we'll call her Lucy. Isn't that great?" the singer tells her TV host on The Bonnie Hunt Show scheduled to air Tuesday.
Adds Wilson, "I love being 40 and pregnant. It rocks! I am Fertile Myrtle, you could say."
Lucy will be Wilson and husband Rob Bonfiglio's second child. Their first daughter, Lola Sofia, was born in April 2005. They publicly announced this new pregnancy in November.
When it came to telling her husband, who was playing a jazz gig the night she learned she was pregnant, Wilson tells Hunt, "I taped the [pregnancy stick] to the door. I drew three little stick figures and then a tiny one and said, 'Guess what?' "
And her 3-year-old's reaction? "I just let her in the whole process. I was with her and we jumped in the kitchen and she said, 'Mommy, Mommy, you're pregnant!' It was a beautiful thing."
Weight a 'Life Struggle'Wilson is a former member of the Wilson Phillips female trio, and Bonfiglio, 41, is a former guitarist for Blush. The two met while on tour and married in June 2000.
At the time she was carrying Lola, Wilson – who underwent gastric bypass surgery in 1999 and later appeared on Celebrity Fit Club 4 – told PEOPLE, "I understand that I'm a role model. But sometimes I just want to be me, Carnie, being pregnant."
She now tells Hunt, "I am glad that I lost 50 lbs. before I got pregnant but honestly, I just push the big old pause button when I get pregnant."
As for her weight, "It's my life struggle," says Wilson. "I feel like the word 'diet' is not a great word because we know that diets don't work. I say [to daughter Lola], 'Let's just eat healthy. This is good for you. Let's just eat more of the healthy stuff.' "
In that regard, she says, "I don't eat red meat anymore. Now I am just a cheese freak because of the pregnancy. I can't stop with the cheese. And bagels."
2005: Carnie struggles with post-partum depression
2002: Read Carnie's plastic surgery diary!
From Brangelina to J.Lo, check out Hollywood's baby boom!