Alison Sweeney
Phil McCarten/Reuters/Landov
"The whole experience of having a little girl, I'd love that," Sweeney, 31, told PEOPLE last month, adding that she often looks at little girls' clothes while shopping for her son Ben, 3.
Sweeney's daughter is expected to arrive in January, she tells ET.
"I am feeling fantastic," she says. "I have moments of extreme morning sickness, but I get through it. Hopefully, I will be past it soon."
Sweeney and her husband, Dave Sanov, announced in June that they were expecting their second child. Since then, Sweeney, who'll be back on Biggest Loser come the new fall season, has continued working out four times a week – and putting all of her energy towards convincing an indifferent Ben that a sibling is a good addition to the family.
"We're working on it," she told PEOPLE.
