Don't let the mom jeans fool you - Jessica Simpson is a style titan.

When you hear the name Jessica Simpson, a number of adjectives might come to mind, but fashion mogul probably isn’t the first. In spite of some unfortunate outings in mom jeans and other unflattering clothing, the Cut reports that Jessica Simpson’s fashion empire is on track to hit $1 billion in sales.

While her collection may not win any awards for innovation or groundbreaking design, the shoes are generally attractive, and more than that, it’s not difficult to imagine Simpson actually wearing her own line. Like her own looks, there are an equal number of hits and misses to be found, but if nothing else it does give the brand some authenticity.

It would be easy for the high fashion fan to dismiss the brand as the kind of mass offering for people who just don’t get fashion, but it’s interesting to see that relatable really does sell. Simpson isn’t runway model thin or even catalog model thin, and in fact, doesn’t always get it right when dressing to flatter her busty, petite frame. She’s been absent from the music charts for a while, and never reached the heights of Britney or Beyonce, so it can’t all be down to celebrity appeal either.

Somehow, in appealing to the approachable (mistakes and all), Jessica Simpson’s managed to become aspirational.

Would you buy acne treatments from this face? Proactiv is betting you will.

Bieber joins Jessica Simpson, Jennifer Love Hewitt and Rolling Stoneâ€s September cover girl Katy Perry among other Hollywood types that have served as celebrity faces for the brandâ€s acne-fighting products.

Greg Renker, who founded the company that markets Proactiv, told People magazine he is confident in Bieberâ€s potential to bring more attention to the brand.

“Justin has millions of fans of all ages and followers online where our consumers spend a lot of their time,” he said.

Indeed Bieber may be the perfect spokesperson for Proactive since he has a primarily teenaged audience and is a teenager himself. Perhaps young guys and girls at a tough age skin-wise will relate more to a 16-year-old star who not only appeals to them but can be seen as going through similar skin problems. The only thing we wonder about is if the smooth, baby-faced singing phenomenon has ever even had a pimple that required Proactivâ€s products. Let’s be honest, most of the celebrity “before” shots are of  a single bump that has to be magnified 10 times to be seen in the first place. Not exactly raging, out of control acne, but we won’t underestimate the power of Bieber when it comes to swaying teenagers. Undoubtedly, even similarly smooth skinned fans will be hoping  for their first spot to feel connected to the pop star, but we’re sure that’s exactly what Proactiv is banking on.

You can check out images from the ad campaign as well as a video featuring Bieber here.