Britney Spears has become an aunt - her teenage sister JAMIE LYNN has given birth to a baby girl.

The Zoey 101 actress, 17, is reported to have checked into the Mississippi Southwest Regional Medical Center in McComb, Mississippi at 4am local time on Thursday (19Jun08), where she welcomed the unnamed tot, according to The National Enquirer.

And the Toxic singer was on hand to help - she was snapped arriving at the hospital early that morning. The baby is Jamie Lynn and her fiance Casey Aldridge's firstborn.

The teen star stunned the Spears family when she announced her pregnancy news last year (07), at the age of 16. (MT/WNWCHP&WNWCZM/LR)

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