Nicole: Wild to ... Mild?

It's a total-life makeover: From her hair to her diet to her friends, see Richie's most dramatic changes. By Serena Kappes

HER BFF

Then: "She's like my sister," Richie once told PEOPLE about her Simple Life costar Paris Hilton (in 2004). But the childhood friends' relationship bottomed out when Richie reportedly screened Hilton's sex video at a party.
Now: Lindsay Lohan (at the MTV VMAs in August) is her go-to girl – and will be a bridesmaid at her wedding. The two even share the same stylist, Rachel Zoe.