A career-threatening throat injury has forced Jordin Sparks to withdraw from Alicia Keys' tour and cancel all performances for the rest of the month, the former "American Idol" champ's rep said Monday. The 18-year-old is suffering from "an acute vocal cord hemorrhage," according to a report in the Post.   

Here's the story from the Associated Press:

"All of her April activities have been postponed or canceled so she can take care of her voice properly," 19/Jive Records spokeswoman Wendy Washington told The Associated Press.

The 18-year-old singer, whose hits include "Tattoo" and "No Air," was scheduled to be the opening act on Keys' tour, which kicked off over the weekend in Hampton, Va. Washington said in addition to missing the tour's first month, Sparks was forced to cancel a planned performance at the Earth Day Network & Green Apple Festival concert in Washington, D.C.

Washington said Sparks is expected to rejoin Keys' tour in May.

"Jordin Sparks is on vocal rest and is expected to make a full and complete recovery," according to a statement from 19/Jive Records. "Sparks has been going nonstop over the past two years and now she's going through the normal course of learning how to manage and care for her voice."

» In the photo:  Singer Jordin Sparks is shown at Muhammad Ali's Celebrity Fight Night on April 5 in Scottsdale, Arizona. (Photo by Chaley Gallay/Getty Images)

» Watch Jordin Sparks & Chris Brown perform "No Air" on "Idol Gives Back" (video below):