Leigthton Meester says she had to stop being a party girl to get to the top. The star is mixing her role on hit show Gossip Girl with a promising movie career and that leaves little or no time for fun night out. I dont hit the parties because I rarely go out. I would be too tired, she said. I rarely find myself physically tired because I make a point of always getting a decent amount of sleep I have to do it and want to do it.. SS