No Doubt's reunion has been thrown into doubt by Gwen Stefani's pregnancy, amid reports she won't perform with the band while she is expecting her second child.

The group was due to return this year with a new album and a tour to promote it. However sources tell OK! Magazine the singer is reluctant to step onstage while she is pregnant, after touring while carrying her 20-month-old son Kingston.

The insider says, "She's going to write a record. But she has doubts about going on stage again while pregnant - too much can go wrong."

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(This news article provided by World Entertainment News Network)