Britney's sis' enjoyed a natural birth, the mag reports.

According to OK! magazine, JAMIE LYNN SPEARS gave birth to her daughter MADDIE BRIANN naturally on Thursday morning -- not by Cesarean Section, as other reports have claimed.

The mag adds that the 17-year-old delivered her seven pound, 11 ounce baby girl without complications, and that mother and daughter are resting up in the company of family including Jamie Lynn's sis' BRITNEY, parents JAMIE and LYNNE SPEARS, and brother BRYAN SPEARS.

Little Maddie Briann is the first child for the "Zoey 101" star and fiancé CASEY ALDRIDGE.