Party Girl is a friendly NPC that was added in the 1.2 update. She sells party supplies to the player. She has a 2% chance every in-game day of spawning once the player has housed at least 14 other NPCs, and there is a house available for her.
It is worth noting that if she dies she only has a 2% chance to respawn every following day.
Terraria 1.2 - Party Girl NPC
She appears to be the only female NPC that doesn't get angry when you talk to her during a Blood Moon.
Party Girl's Names
Party Girl's Quotes
"My name's <NPC NAME> but people call me party pooper. Yeah I don't know, it sounds cool though"
"Wow, <Character name>, meeting an adventurous man like you makes me want to party!"
"Put up a disco ball and then I'll show you how to party."
"I went to Sweden once, they party hard, why aren't you like that?"
"We should set up a blinkroot party, and we should also set up an after-party."
"Do you party? Sometimes? Hm, okay then we can talk..."
"We have to talk. It's... it's about parties."
"I can't decide what I like more: parties, or after-parties."
"I think it is about time I got my hair did!" (Only if Stylist is present)