Tori Spelling is hospitalized with an unknown stomach ailment, her rep confirms to Usmagazine.com.
"Tori went to the hospital last night for abdominal pain," her rep tells Us. "They released her last night."
But Spelling, 36, was readmitted Tuesday.
"She wasn't feeling better today so she returned to the hospital for more tests," the rep continues.
Husband Dean McDermott wrote on Twitter Monday night: "T is in the hospital now with severe stomach pains. We're trying to get her comfortable."
Later that evening, he wrote: "Just out of the hospital. After a battery of tests, no conclusive answers. She still feels terrible. Hope it passes soon. She's in a lot of pain."
He has not updated his Twitter page about Spelling's health Tuesday.
The Tori and Dean: Home Sweet Hollywood stars are parents to Liam, 2, and Stella, 15 months.