Blush.com crashes due to excitement over cosmetics line. (Photo : PR Newswire)

Within minutes of a presale sign-up for sisters Elle and Blair Fowler's new cosmetics line, blush.com, a beauty site distributing the line, crashed down because of so much traffic. 

The YouTube sensations and authors will be launching their new makeup line called Skylark by Elleand Blair in September 2012.  The release will also coincide with the debut of their first novel, Beneath the Glitter.

"We are thrilled to know that Elle and Blair's fans are so enthusiastic about Skylark," said Dan Obegi, blush.com and DermStore.com's CEO, in a press release.  "While we knew they had a devoted following, we could have never imagined numbers like this."

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Skylark will also feature two special lip glosses that were inspired by the main characters of their book, Sophia and Ava London.  New products will be added to line seasonally, as well.