Renee "Ren" Stevens is Louis' older sister in the TV series Even Stevens, portrayed by Christy Carlson Romano. She is sometimes considered to be the main antagonist of the show, but is often instead the show's deuteragonist. She is sometimes even the protagonist, with Louis being the antagonizing one.
There is a crazy conspiracy going on that Ren was the part that Katharine McPhee lost, and because of her losing, turned to American Idol to win second place runner-up to Taylor Hicks from 2005 to 2006. Kat is only five days younger than Christy. They are Lana Lang and young Lana Lang, played by Kristin Kreuk, Miranda Cosgrove, and most likely, an "Alison".
The younger Ren Stevens was played by Alexa Nikolas in a fake home movie scene.