Britney Spears' pregnant sister, 16, covers up her baby bump

Since falling pregnant late last year, 16-year-old Jamie Lynn Spears has kept a low profile.

And yesterday, the younger sister of Britney Spears was her usual shy self as she covered up her baby bump.

Teen actress Jamie Lynn, who is expecting a child with boyfriend Casey Aldridge, was all smiles as she enjoyed a day in the sunshine in her native Louisiana.

Pregnancy glow: Britney Spears's pregnant sister Jamie Lynn Spears in Louisiana yesterday. She was proudly showing off her baby bump

Wearing a loose-fitting white blouse, comfortable denim-shorts and Uggs boots, she was obviously enjoying her pregnancy as she carried a coffee after dinner at a Mexican restaurant.

Jamie Lynn is reportedly around six months along.

Not surprisingly, the teenagers's pregnancy has been exposed to constant gossip since she announced the news late last year in a U.S. magazine.

Pregnancy glow: Jamie Lynn Spears, 16, ventured out to dinner in Louisiana yesterday. She left the eaterie clutching a pair of T-shirts

The pregnancy, which has been a staple fixture in U.S. gossip columns, coincided with Britney's well-documented problems.

In January it was reported that Jamie Lynn had been dumped by boyfriend Casey Aldridge because he doubted he is the father.

Aldridge, it was said, insisted that she has a paternity test to prove he is the child's father. The report was denied by Spears' representatives.

Baby on board: Jamie Lynn Spears has been shy about being photographed with her emerging bump until now