Britney Spears' pregnant sister Jamie Lynn has split from her boyfriend.

Jamie, who revealed she is 12 weeks pregnant (rumored to be having a spring baby) with her first baby with childhood sweetheart Casey Aldridge, is now seemingly single.

Yesterday, Casey, 17, set his mood to 'Blah' on social networking
site MySpace and changed his status to "Me and Jamie are over :(".

Jamie, who stars as a schoolgirl in hit Nickelodeon TV show 'Zoey 101',
revealed she was "scared" to tell her parents she is expecting a baby.

She said: "I took two weeks to myself where I didn't tell anybody. Only one
of my friends knew because I needed to work out what I would do for myself
before I let anyone's opinion affect my decision.

"Then I told my parents and my friends. I was scared, but I had to do what
was right for me. My mom was very upset because it wasn't what she expected
at all. A week after, she had time to cope with it and became very
supportive."

Jamie's father, also called Jamie, is said to have been left "devastated" by
the announcement.

A source close to the Spears family told Us Weekly magazine: "Jamie is
devastated by the news. He is extremely depressed and feels Jamie Lynn has
ruined her life."

It has also been claimed Britney's ex-husband Kevin Federline found out
about the pregnancy before the 'Toxic' singer so he could be prepared for
the "fallout".

The source added: "Kevin knew before Britney that Jamie Lynn is pregnant. In
fact, Britney's mom Lynne, told Kevin about it on Monday, because Lynne
wanted Kevin to be prepared when Britney found out."

He's such a stoner, that's why Brit's boys might be tested positive for the drug in their system.