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Baby on board!

Former Desperate Housewives actress Drea de Matteo is expecting her second child with fiancé Shooter Jennings, a source tells

Jennings, 31, later confirmed the news on Twitter when a pal congratulated the Hierophant rocker on his expanding brood. "Thanks brother," Jennings simply wrote.

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Due in the spring of 2011, the couple's latest addition will join their daughter Alabama Gypsyrose, born in November 2007.

The rocker proposed to de Matteo, 38, during a NYC concert in June 2009; they have not set a wedding date.