All thanks to the raunchy performance at the MTV Video Music Awards, almost everyone on the planet knows Miley Cyrus. Yet, do they know Noah Cyrus? Quite a few well-known Hollywood celebrities have siblings that have only shared a fragment of the limelight. From Gemma Styles to Dallas Lovato, here are the notable siblings of Hollywood's hottest stars.

First up are Dallas Lovato and Madison De La Garza, "X-Factor's" Demi Lovato's sisters. Back when Lovato was still with Disney, Dallas got featured in an episode for both "Sonny with a Chance" and "Wizards of Waverly Place." Why then wasn't a special show featured for the Lovato sisters? Apparently, Demi only found out about her siblings early this March.

"I think my fans would be excited to learn that I just got to know I have an older sister that I've never known my whole life. I actually have a third sister that I didn't even know about until this year. She's in her thirties. She's my half-sister, but I talked to her for the first time in my life when I turned 20," stated Lovato in an interview with New York Web Radio Station, WBLI.

Next up is Noah Cyrus, "twerking" queen's Miley Cyrus' younger sister. Miley's sister appeared in a few episodes for "Hannah Montana" the series and the film. However, Noah has left off acting for a career in horseback riding. Billy Ray Cyrus' youngest daughter had been featured in Teen Vogue back in May where she talked about her Olympic hopes in equestrianism. The latest on Noah Cyrus aside from her crush on Harry Styles of One Direction is that she's currently in a relationship with Pierce Brosnan's son, Paris Brosnan.

Check out the slideshow to find out more about the siblings of today's hottest Hollywood stars.

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