Britney Spears's comeback is on track, according to a producer who confirms he is working with the newly rehabbed singer. "I know she'll do exceptionally well now that she's out of rehab," producer Sean Garrett says, and adds that her work is "really coming together right now." Garrett is collaborating on five tracks with the popstar, and says the sound is like Toxic "times ten." "It's going to be a lot of fun and it's really exciting," says the producer. "We did a lot of great work before her break."