Posh Puts Kibosh on Nipple Shots 5/18/2007 11:05 AM PT

TMZ spotted Posh at the Arclight movie theatre, where it was obvious that she's learned some of her black clothes become see-thru under camera lights (it only took her countless revealing trips through airport terminals and appearances on soft core celebrity websites ... not that we're looking). Beckham kept her arms to her chest and continually pulled her sweater closer as she walked, almost timidly, to the movie theater -- a far cry from the last time we caught her stateside. Couldn't she just rock a thicker bra?

So, does this mark the dawning of a more conservative Posh? Let's hope not!