They grow up so fast -- Britney and Jamie Lynn, that is.
Jamie Lynn and baby Maddie showed up for Britney's joint birthday party for Jayden James (2) and Sean Preston (3) yesterday -- where Brit and her "weave you see from space" watched the kiddies play in an inflatable jumper.
Brings back memories.
Britney's Boo Boos Get Their Own Padded Room
9/14/2008 10:31 AM PDT BY TMZ STAFF
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