A poser is someone who poses for something. Trying to be something they're really not. They want to be it so bad (wannabe), but unfortunately they don't do it naturally. People can see right through posers. Usually posers are a midway of things because posers are always "half-in" than full.
The Pussycatdolls are posers. They are a group of six or seven talentless girls who can't sing or dance for their live. They wear tacky, slutty, clothing and hope that their skimpy clothes make up for their lack of talent. I still don't know if they are trying to be showgirls, prostitutes, or dirty broadway singers.