Stars celebrating milestone birthdays in 2016

From Princess Charlotte turning one to Kirk Douglas's centennial, these stars are ringing in special birthdays this year... <p>Photo: © Getty Images</p>
<b>1</b> They've grown so fast! These celebrity infants will hit their toddler years soon, and we can't wait for the adorable Instagram posts and updates. <p>Clockwise from top left: Princess Charlotte of Cambridge, Lucy Liu's son Rockwell, Coco Rocha's daughter Ioni, Saint West, Justin Timberlake and Jessica Biel's son Silas and Prince Nicolas of Sweden.</p> Photo: © HRH Duchess of Cambridge, Instagram, Getty Images
<b>10</b> We can't believe these A-list kids, like Suri Cruise and Shiloh Jolie Pitt, are hitting their tweens already! <p>Other notables: Kingston Rossdale (Gwen Stefani and Gavin Rossdale) and Moses Martin (Gwyneth Paltrow and Chris Martin)</p> Photo: © Rex
<b>18</b> <p>Elle Fanning rings in her 18th birthday on April 9. The star has already acquired an impressive CV, acting alongside heavyweights like Angelina Jolie, Susan Sarandon, Matt Damon and Brad Pitt.</p> Other notables: Shawn Mendes, Paris Jackson, <em>Modern Family</em>'s Ariel Winter and Jaden Smith <p>Photo: © Getty Images</p>
<b>20</b> These stars will be leaving their teen years behind and starting the countdown to the landmark age of 21. Although they're just getting started, these young adults have already excelled in their careers. From left, Hailee Steinfeld, Lorde and Zendaya. <p>Other notables: Abigail Breslin, Bella Hadid and Hailey Baldwin</p> Photo: © Getty Images
<b>21</b> <p>Best friends Gigi Hadid and Kendall Jenner will celebrate their 21st birthdays this year. The models have already marked one monumental moment together, walking in their first Victoria's Secret Fashion Show in 2015.</p> Photo: © Getty Images
<b>30</b> It's time to hit the big 3-0 for some of our favourite stars who spent their 20s building their careers. What could be in store over the next decade? <p>From left: Charlotte Casiraghi, Drake, Lady Gaga</p> Other notables: Robert Pattinson, Lena Dunham, Megan Fox, Amber Heard, Solange Knowles and Mary Kate and Ashley Olsen</p> Photo: © Getty Images
<b>40</b> Stars like Reese Witherspoon look better than ever as they wave goodbye to their 30s and say hello to the 'Fabulous 40s.' <p>Other notables: Ryan Reynolds, Freddie Prinze Jr, Blake Shelton, Benedict Cumberbatch, Colin Farrell, Diane Kruger and Princess Marie of Denmark. </p> Photo: © Getty Images
<b>50</b> <p>Not only are they proving that 50 is the new 30, these stars are at the top of their game and look flawless while doing it. From left: Cindy Crawford, Salma Hayek and Halle Berry.</p> Other notables: Adam Sandler, Robin Wright, Kiefer Sutherland, Patrick Dempsey and Julianna Margulies <p>Photo: © Getty Images</p>
<b>60</b> <p>These legends have proved that they have staying power. With track records like theirs, who knows what amazing accomplishments they'll surprise us with next! From left: Tom Hanks, Carrie Fisher and Bryan Cranston.</p> Other notables: Kim Cattrall, Rita Wilson, Mel Gibson <p>Photo: © Getty Images</p>
<b>70</b> <p>Millennials? What millennials? These baby boomer icons born in 1946 continue to steal the show, and it seems there's no slowing them down.</p> From left, Diane Keaton, Sylvester Stallone and Cher. <p>Photo: © Getty Images</p>
<b>80</b> <p>Birthday boy Robert Redford, seen here with his <em>The Way We Were</em> co-star Barbra Streisand, 73, is just one of the beloved Hollywood icons who is still entertaining fans after decades in the business.</p> Other notables: Burt Reynolds and Mary Tyler Moore <p>Photo: © Getty Images</p>
<b>90</b> Forever young! Led by Queen Elizabeth, who celebrates her birthday on April 21, this group knows a thing or two about eternal youth, dedication to your career and living life to the fullest, if only they'd reveal their secrets! <p>Other notables: Tony Bennett and Cloris Leachman</p> Photo: © Getty Images
<b>100</b> <p>Hollywood great Kirk Douglas has the most special birthday of all. Born in New York on Dec. 9, 1916, Michael Douglas's father made his screen debut at the age of 30 and with his career spanning more than 90 films and television shows, including classics like <em>Spartacus</em>, he has earned a place in both our hearts and Hollywood history.</p> Photo: © Getty Images
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