Khloe Kardashian is mortified when she looks at old photos of herself.

The reality star has a successful fashion range to her name alongside her sisters Kim and Kourtney, with their new Spring/Summer Kardashian Kollection 2014 for Lipsy out now, but she hasn't always has such a good sense of style and used to dress in men's tracksuits as a teenager.

Asked if she ever gets embarrassed by her fashion faux-pas, Khloe laughed: ''Yeah... like every teenage picture I've ever seen of myself. That is the beauty of fashion, you're supposed to experiment and try things.

''But sometimes you don't know until you see yourself in pictures and then you're like, 'Oh, what was I thinking?!' I used to wear men's sweatsuits out and think I was really cool as a teenager. Really baggy men's sweatsuits, that is never a good look. But I thought I was so cute.''

The 29-year-old beauty's younger half-siblings Kylie and Kendall Jenner have also branched out into fashion, with a clothing collection for PacSun and a shoe range for Madden Girl.

However, Khloe insists the older girls have never needed to come to their rescue and believes her sisters will be successful as long as they put passion into their work.

Khloe explained exclusively to BANG Showbiz: ''We have learned everything as we go. Every piece in our Kollection all three of us would wear - and we would wear it differently. But you have to love every piece you design, you can't just have a specific person in mind.

''I think Kendall and Kylie have to love what they create and what they're putting out there. And if they love it, if you're passionate about it, then your line will do great because you have that passion there. And that's something we tell them, they have to genuinely love what they do.''

The Kardashian Kollection for Lipsy is available in selected Lipsy stores and at