Taylor Momsen Hospitalized After Battling Life-Threatening Throat Infection

Taylor Momsen was released Wednesday afternoon from L.A.'s Cedars-Sinai Medical Center after battling a "severe, potentially life-threatening throat infection. "I have been treating Miss Taylor Momsen for the last few days," Momsen's doctor, Shawn Nasseri, tells Usmagazine.com. "She has been hospitalized for a severe, potentially life-threatening throat infection since Sunday. "She has been an excellent patient, and after aggressive antibiotics and medications, she is expected to make a full recovery in the next three to five days," the doctor adds. Momsen, 15, was in L.A. to take a school exam when she "woke up with a sore throat," a source close to the actress tells Us. "She thought it was just a common cold, but was advised to see an ear, nose and throat specialist before getting on a plane back to New York," the source adds. After discovering how serious the situation was, "her mom flew out to get her, and is flying back [to NYC] with Taylor this week. "She's in unbelievable spirits" despite the diagnosis, the source says.

On Wednesday night, the CW announced Momsen would be back to work by the end of the week. "Taylor Momsen is a beloved member of our Gossip Girl cast and we are happy to report she is on the road to a speedy recovery," the network said in a statement to Us. "We all look forward to her planned return to work on Friday."