Jamie Lynn Spears' pregnancy boosts the popularity of 'Zoey 101'

Jamie Lynn Spears' teenage pregnancy has boosted the popularity of her hit TV show.

Britney Spears' 16-year-old sister stunned the showbiz world when she announced that she is having a baby with boyfriend Casey Aldridge. But new viewing figures prove that fans of 'Zoey 101' have not been put off by the pregnancy.

The fourth series of 'Zoey', which was taped before Spears became pregnant, is averaging 4.6m viewers since its January 27 premiere, the New York Post reports.

That is up from its average of 2.9m viewers last autumn.