Brad Pitt may have worldwide fame, but have you heard of Doug Pitt? No? Sounds about right.

Doug, who is Brad's young brother, stars in a new video for Virgin Mobile Australia, where he is touted as "the second most famous Pitt in his family." (We wonder how the brothers' young sister Julie feels about this title.) In the clip, Doug gives a tour of his house, cooks up some lasagna, and goes on a bike ride -- pretty run-of-the-mill activities for a run-of-the-mill guy, whose brother Brad just happens to be super famous.

"While his brother lives the life of a Hollywood A-lister, Doug's life is a little different," the ad's narrator proclaims. "Virgin Mobile believe in a fair go for all, and want to give Doug a taste of his brother's lifestyle, starting with his first-ever celebrity endorsement."

Doug may not be in the spotlight often, but that's not the case for many other celebrity siblings. From the Olsen twins and their younger sister, Elizabeth, to Hollywood familes including the Jacksons, Baldwins, Arquettes, and, yes, even the love-to-hate-them Kardashians, sometimes star power just runs in the family.

Check out Doug's video above and then check out photos of some famous siblings below. If his endorsement deals keeps rolling in, maybe we'll include Doug Pitt in the next go-around:

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  • Famous Siblings

    Ashley Olsen, Mary-Kate Olsen & Elizabeth Olsen

  • Famous Siblings

    Liam Hemsworth & Chris Hemsworth

  • Famous Siblings

    Billy Baldwin, Stephen Baldwin, Alec Baldwin & Daniel Baldwin

  • Famous Siblings

    Ashlee Simpson & Jessica Simpson

  • Famous Siblings

    Maggie Gyllenhaal & Jake Gyllenhaal

  • Famous Siblings

    Spencer Breslin And Abigail Breslin

  • Famous Siblings

    Jason Bateman & Justine Bateman

  • Famous Siblings

    Marie Osmond & Donnie Osmond

  • Famous Siblings

    Garry Marshall & Penny Marshall

  • Famous Siblings

    Shirley MacLaine & Warren Beatty

  • Famous Siblings

    James Franco & Dave Franco

  • Famous Siblings

    Mark Ronson, Charlotte Ronson, Samantha Ronson (with mom Ann Dexter-Jones, far right)

  • Famous Siblings

    Mark Wahlberg & Donnie Wahlberg

  • Famous Siblings

    Julia Roberts & Eric Roberts

  • Famous Siblings

    Kevin Dillon & Matt Dillon

  • Famous Siblings

    Alexis Arquette, David Arquette, Patricia Arquette, Richmond Arquette & Rosanna Arquette

  • Famous Siblings

    Josh Meyers & Seth Meyers

  • Famous Siblings

    Ben Affleck & Casey Affleck

  • Famous Siblings

    Joel Madden & Benji Madden

  • Famous Siblings

    Hilary Duff & Haylie Duff

  • Famous Siblings

    Nick Jonas, Kevin Jonas & Joe Jonas

  • Famous Siblings

    Emilio Estevez & Charlie Sheen (pictured with dad Martin Sheen, far right)

  • Famous Siblings

    Lindsay Lohan & Ali Lohan

  • Famous Siblings

    The Jackson Siblings: La Toya Jackson, Tito Jackson, Jackie Jackson and Marlon Jackson (not pictured: Jermaine Jackson, Janet Jackson, Rebbie Jackson, Randy Jackson & the late Michael Jackson)

  • Famous Siblings

    John Cusack & Joan Cusack (siblings Ann, Bill & Susie Cusack are also actors)

  • Famous Siblings

    Drew Lachey & Nick Lachey

  • Famous Siblings

    Marlon Wayans, Keenen Ivory Wayans and Shawn Wayans (not pictured: Damon, Kim, Elvira & Nadia Wayans)

  • Famous Siblings

    Miley Cyrus & Trace Cyrus

  • Famous Siblings

    Oliver Hudson & Kate Hudson

  • Famous Siblings

    Tamera Mowry-Housley & Tia Mowry (Not picture: Taj Mowry)

  • Famous Siblings

    Issac Hanson, Zach Hanson & Taylor Hanson

  • Famous Siblings

    Dakota Fanning & Elle Fanning

  • Famous Siblings

    Brandy & Ray J

  • Famous Siblings

    Beyonce Knowles & Solange Knowles

  • Famous Siblings

    Robyn Lively, Blake Lively and Lori Lively (Not pictured: Eric Lively, Jason Lively)

  • Famous Siblings

    Britney Spears & Jamie-Lynn Spears

  • Famous Siblings

    Macaulay Culkin, Kieran Culkin

  • Famous Siblings

    Haley Joel Osment And Emily Osment

  • Famous Siblings

    Jeff Bridges & Beau Bridges

  • Famous Siblings

    Chad Lowe & Rob Lowe

  • Famous Siblings

    Andrew Wilson, Owen Wilson & Luke Wilson

  • Famous Siblings

    The Bee Gees: Barry Gibb, Robin Gibb and Maurice Gibb

  • Famous Siblings

    Jane Fonda & Peter Fonda

  • Famous Siblings

    Ashley Judd & Wynonna Judd

  • Famous Siblings

    Michael Madsen & Virginia Madsen

  • Famous Siblings

    Kendall Jenner & Kylie Jenner

  • Famous Siblings

    Kim Kardashian, Khloe Kardashian, Kourtney Kardashian & Rob Kardashian

  • Famous Siblings

    Kirk Cameron & Candice Cameron Bure

Did we leave off your favorite celebrity siblings? Tell us who we should include in the comments below!