"The Client List" star Jennifer Love Hewitt is expecting her first child.

"We're so thrilled and happy to start a family," Hewitt and her boyfriend and co-star, Brian Hallisay, both 34, told Us Weekly in a statement Tuesday. The magazine said the actress is three months pregnant.

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The couple began dating 15 months ago after Hallisay began playing Kyle Parks on Hewitt's Lifetime drama series, initially as a recurring role and then as a series regular.

Hewitt was previously in a relationship with Scottish actor Ross McCall, whom she met on the set of her CBS series, "Ghost Whisperer," in 2005. They became engaged in November 2007, but called off their engagement late the following year. In March 2009, Hewitt began dating her "Ghost Whisperer" co-star, Jamie Kennedy. They broke up after a year.

During a conference call with press in 2010, Hewitt, long the subject of pregnancy speculation, joked that, "The paparazzi has been saying I'm pregnant for four years now and I have yet to pop out a baby! They've kind of already done that with me so I feel that when the moment comes, they'll say, 'We don't care -- you've been pregnant for 18 years already!'"

Hewitt first gained fame for her role as Sarah Reeves on the Fox drama "Party of Five" (1995-99)