Louise, who split with Spencer earlier this year, has however been completely won over by the US reality star now she has got to know her while hanging out in London.
Speaking exclusively to Reveal at Virgin Media's V Festival, Louise said: "I actually really like Stephanie.
"I didn't like her in The Hills, as she seemed at bit crazy, but she's totally not like that.
"If anything, Stephanie is one of the most normal and down to earth people in our group of friends. I really like her."
Earlier this month, Stephanie was pictured filming scenes for Made In Chelsea with Spencer and Louise.
Although she has been in front of the camera with the blonde American, who has moved to the UK to be with Spencer, Louise is still excited to see how she comes across on the E4 reality show.
Chatting to us in the Virgin Media Louder Lounge, Louise added: "I can't wait to see her on the show!"
Louise dated Spencer for more than a year and it's fair to say things were incredibly bitter between them in the aftermath.
But despite their past differences, Louise seems genuinely happy for her ex: "Stephanie and Spencer are so loved-up. It's all good," she admitted.
Check out all the pictures from this year's Virgin Media's V Festival in our gallery!
Copyright: Rex Features AKEM