According to E! Online, she scrapped a gig that was to be held on May 3 in Oakland, California.
She is also said to have scrapped scheduled stops in Phoenix, Arizona, Biloxi in Mississippi and two concerts in Texas.
Jennifer last staged a gig on May 2 in Los Angeles, and turned it into a birthday tribute to the manager who helped her cope after the 2008 murders of her mother, brother and nephew.
She surprised her manager with a cake and a chorus of Happy Birthday, reports Contactmusic.
The audience of the Nokia Live also saw star guests — like Chaka Khan and Earth, Wind and Fire stars Philip Bailey and Verdine White — joining Jennifer on stage.
It is said that the scrapped Oakland gig will now be staged on May 19.
Other postponed dates are expected to be rescheduled shortly. (ANI)
Get well soon, Jenny!