JLSPEARSHAPPY031208_01.jpgJamie Lynn Spears JLSPEARSHAPPY031208_08.jpg Pregnancy can do funny things to a young woman - but can it turn her into a thief?

Yesterday, our paps were down in Louisiana checking in with Jamie Lynn Spears as she went about her daily routine. Everything seemed to be going fine until Jamie Lynn decided that she'd had enough attention - and grabbed the keys to our guys' car right out of the ignition!

Luckily for our guys, the pregnant starlet returned a few minutes later with a smile and an assurance that it was all a big joke. Hey, we can take a joke - especially when it runs in the family!

(We're pretty sure she was kidding when she started talking about making her whole pregnancy up, too - now that would be one for Pop Fiction!)