Britney Spears

Britney Spears' producer has hit back at persistent reports the singer's comeback album is destined to be a flop.

Sean Garrett, who has also worked with Beyonce Knowles, Jennifer Lopez and Mary J. Blige, insists the star has put her recent troubles behind her and studio efforts so far have been promising.

He says, "It's really coming together.

"I know she'll do exceptionally well now she's out of rehab."

Spears was released from the Promises rehab facility last month after completing a month long treatment for unspecified substance abuse problems. She hasn't released an album of new material since 2003's In The Zone.