Jessica Simpson,Tia Mowry, Beyoncé Knowles

Jessica Simpson was hospitalized in Los Angeles for a kidney infection, her rep tells PEOPLE.

The singer "has been released and is doing fine," the rep says.

Simpson, 27, went to Cedars-Sinai Medical Center on Friday after suffering a fever.

Earlier this month, Simpson took a trip to Iraq where she performed for the troops. She is currently working on a country album.

In less than three weeks, Tia Mowry will marry her longtime beau Cory Hardrict in a Santa Barbara ceremony – and she's getting some support from twin sister Tamera as the big day approaches.

Beyoncé Knowles and longtime beau Jay-Z have taken out a marriage license in Scarsdale, N.Y. According to a source, the pair obtained a license . The document is valid for 60 days.