^^ I think it really varies from person to person a whole lot, but as a (very) general rule around 4 months.
They announced she was pregnant in October 2005. She was showing then, so if she was at the very least 4 months, she got pregnant in June or thereabouts. This month would make 9 months and we're less than a week from April.
Crazy shit all the way around. I just can't believe she's preggo. I think a kid will show up, but it won't spring from her body.