Hollywood's full of dynamic duos, and we're not talking about all of the superhero flicks! As the global birth rate of twins has steadily risen , Tinseltown's mamas are no exception. The growing use of IVF and an increase in maternal age have made twins the norm, more than the exception. See which celeb moms and dads are having double the fun as they juggle their careers, fame, and raising twins.
Julia Roberts and Danny Moder
Julia Roberts and hubby Danny Moder welcomed boy/girl twins, Hazel and Phinnaeus, in November 2004.
Ricky Martin's twin boys, Valentino and Matteo, were born via surrogate in 2008.
Angelina Jolie and Brad Pitt
Angelina Jolie  and Brad Pitt  welcomed twins Knox Leon and Vivienne Marcheline in 2008. That's a total of six kids for the couple.
Garcelle Beauvais is mom to twin boys, Jaid Thomas and Jax Joseph, born in 2007.
Marcia Gay Harden
Marcia Gay Harden and her husband, Thaddaeus Scheel, welcomed twins — a boy, Hudson Harden Scheel, and a girl, Julitta Dee Harden Scheel — in 2004.
Neil Patrick Harris and David Burtka
Neil Patrick Harris  and David Burtka became parents in 2010, with the birth of their twins, son Gideon Scott and daughter Harper Grace.
Raymond Romano has four children, including twin sons Matthew and Gregory, born in 1993.
Michael J. Fox and Tracy Pollan
Michael J. Fox and wife Tracy Pollan have four children, including twin girls born in 1995, Aquinnah Kathleen Fox and Schuyler Frances Fox.
Sean "Diddy " Combs and Kim Porter had twin girls D'Lila Star and Jessie James, in 2006.
Julie Bowen is mom to three boys, including twins John and Gustav, born in 2009.
Angela Bassett and Courtney B. Vance had twins Slater Josiah and Bronwyn Golden in 2006 via surrogate.
Sarah Jessica Parker and Matthew Broderick
Matthew Broderick  and Sarah Jessica Parker 's twin daughters — Marion Loretta and Tabitha Hodge — were born in June 2009 via surrogate.
Holly Robinson Peete
Holly Robinson Peete and former NFL quarterback Rodney Peete have four children. In 1997 couple had fraternal twins, Ryan and Rodney Jr., who both are affected by food allergies .
Molly Ringwald gave birth to twins, Roman Stylianos and Adele Georgiana, in 2009.
Rebecca Romijn and Jerry O'Connell
Rebecca Romijn  and Jerry O'Connell 's twin girls, Charlie Tamara Tulip and Dolly Rebecca Rose, were born in December 2008.
Marcia Cross  and husband Tom Mahoney, are parents to fraternal twin girls Eden and Savannah, born in February 2007.
Jennifer Lopez and Marc Anthony
Jennifer Lopez  and Marc Anthony 's twins — Max and Emme — were born in February 2008.
Celine Dion and René Angélil
Celine Dion and husband René Angélil welcomed fraternal twins Nelson and Eddy, in October 2010 after six rounds of in vitro fertilization.
Melissa Etheridge and former partner Tammy Lynn Michaels share custody of their twins, son Miller Steven and daughter Johnnie Rose.
Dennis Quaid and Kimberly Buffington
There was nothing ordinary about the birth of Dennis Quaid and Kimberly Buffington's twins, Thomas Boone and Zoe Grace, born via surrogate in 2007. The babies had to fight for their lives after they were given an accidental overdose of Heparin. They recovered, but dad Quaid remains an activist, speaking out about medical errors.