Kate and William watch as Prince George looks at an Australian animal called a bilby, which was named after the young prince, during a visit to Sydney's Taronga Zoo on April 20, 2014.
Kim Kardashian holds her daughter North West in her arms as she shops in Paris, France, on May 20, 2014.
Beyoncé and her daughter, Blue Ivy, in the HBO documentary "Life is But a Dream."
Actor Vin Diesel poses with his daughter Hania Riley during a ceremony to unveil his star on the Hollywood Walk of Fame in Hollywood on Aug. 26, 2013.
Actress and singer Jennifer Hudson (center) poses with her fiance David Otunga (right), their son David Jr., and her sister Julia Hudson (left) on her star after it was unveiled on the Walk of Fame in Hollywood on Nov. 13, 2013.
Brad Pitt and Angelina Jolie arrive with their children Knox (second from right), Vivienne (third from right) and Pax (left) at Haneda international airport in Tokyo on July 28, 2013.
Actress Melissa Joan Hart poses with her husband Mark Wilkerson and three sons at the American premiere of "Despicable Me 2" at Universal CityWalk and Gibson Amphitheatre in Universal City, Calif., on June 22, 2013.
Singer and actress Jennifer Lopez gestures while holding her son Max before unveiling her star on the Walk of Fame in Hollywood on June 20, 2013.
Actress Angela Bassett and daughter Bronwyn Vance arrive at the 2013 Kids Choice Awards in Los Angeles on March 23, 2013.
Singer Alicia Keys and her son Egypt Daoud Dean attend the Ralph Lauren Fall 14 Children's Fashion Show in Support of Literacy at New York Public Library on May 19, 2014.
Actor John C. Reilly sits courtside with his son during the NBA game between the Los Angeles Lakers and Houston Rockets in Los Angeles on Nov. 18, 2012.
Actress Jennifer Connelly (center), husband Paul Bettany and son Stellan sit in the gallery at the U.S. Open tennis tournament in New York City on Sept. 9, 2012.
Actress Alyssa Milano and her son Milo Bugliari attend the world-premiere of "Disney's Planes" at the El Capitan Theatre on Aug. 5, 2013, in Hollywood, California.
Actress Jada Pinkett-Smith (left) arrives with her daughter Willow (center) and son Jaden at Nickelodeon's 25th annual Kids' Choice Awards in Los Angeles on March 31, 2012.
Actress Ali Landry and daughter Estela Monteverde arrive at the Hollywood world premiere of "Mirror Mirror" in Los Angeles on March 17, 2012.
Mariah Carey laughs with her husband Nick Cannon and their son Moroccan Scott Cannon at the BET Honors in Washington, D.C., on Jan. 14, 2012.
Singer Pink, her husband, freestyle motocross motorcycle racer Carey Hart, and their daughter Willow Sage Hart arrive at the premiere of "Happy Feet Two" in Hollywood on Nov. 13, 2011.
Natalie Maines (left), lead singer for the band Dixie Chicks, her husband actor Adrian Pasdar, and their sons Jackson and Beckett pose at the premiere of "Real Steel" in Los Angeles on Oct. 2, 2011.
"Daily Show" host Jon Stewart gets a playful punch on the cheek from his son Nate in the fourth quarter of the New York Knicks' game with the Cleveland Cavaliers at Madison Square Garden in New York City on March 4, 2011.
Celine Dion arrives at Caesars Palace in Las Vegas with her husband and sons on Feb. 16, 2011. Dion is holding her son Nelson. Her husband Rene Angelil is holding Nelson's twin brother Eddy. Their son Rene-Charles is in front of his father at lower right.
Actor and comedian Adam Sandler and wife Jackie hold their daughters, Sunny Madeline (left) and Sadie Madison (second from right), as they pose for photos during a ceremony honoring Sandler with a star on the Hollywood Walk of Fame on Feb. 1, 2011.
Ethan Hawke and his son, Levon Roan Thurman-Hawke, sit courtside at a New York Knicks-Phoenix Suns game at Madison Square Garden in New York City on Jan. 17, 2011.
Elizabeth Hurley and her son, Damian Hurley, arrive at an event on Dec. 22, 2011, in Melbourne, Australia.
Tom Cruise holds his daughter Suri during a break in the filming of "Knight & Day" in Seville, Spain, on Dec. 11, 2009.
Actor Clint Eastwood, wife Dina and daughter Morgan pose on the red carpet at the opening of hotel magnate Sol Kerzner's One and Only hotel in Cape Town's Waterfront district on April 2, 2009.
Victoria Beckham speaks to her son Cruz during a soccer match between AC Milan and Hamburg SV in Dubai on Jan. 6, 2009.