Lena Dunham, Girls, John Mayer, Bridesmaids, SXSW

HBO, Michael Caulfield/WireImage, Universal Studios

South by Southwest (aka SXSW, if you're hip!) is an annual festival of music, movies and technology. And it kicks off tomorrow!

Besides luring big stars down to Austin, Texas, for a week of parties (Justin Timberlake, Olivia Wilde and Matthew McConaughey are expected this year), the week-and-a-half-long gathering has been a launching point for new musicians, directors and apps in the past.

Don't believe us? Just ask Lena Dunham who turned her buzz in to a hit HBO series, John Mayer who signed a record label and later won a bunch of Grammys or a little social media platform called Twitter.

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