TMZ caught up with Britney Spears' younger sister Jamie Lynn @ The Buzz in Hammond, Louisiana. I guess this is where unwed 18-year old mommas go to let loose. I can't say I blame her, who wouldn't want to get away from changing nappies and crying babies.

Here she is with BF, and father of her little girl, Casey Aldridge, sippin' on cocktails @ the club. She doesn't look too impressed with the extra company in the bottom pic! Well, you know what I always say... the more the merrier. Too bad she doesn't feel that way!

Images via TMZ