Jamie Lynn Spears and her big sis Britney have been buying up all things blue at the luxe baby boutique Petit Tresor in West Hollywood.  That’s right, kids. There will be another Spear’s male heir.

Page Six reports that Jamie will be using Petit Tresor to outfit her little one’s nursery as well. Little sis has decided on an ocean theme for her baby’s first bedroom and has already purchased $7,000 of basic furniture. Interesting point; Jamie Lynn bought a round crib just like her big sis had for her two boys. Page Six also says that Jamie seems to be having a great time getting ready for her mini-Spears.

“This is the most fun I’ve had shopping in a long time,” Jamie Lynn said.

Most sisters we know hand-me-down their baby stuff, but given the fact that Jamie Lynn  got knocked-up about 10 years too early…..