PARK CITY, UT - JANUARY 17: Actress Kristen Stewart attends the 'Camp X-Ray' premiere at Eccles Center Theatre during the 2014 Sundance Film Festival on January 17, 2014 in Park City, Utah.
Kristen Stewart
celebrates her 24rd birthday this week! Now that the “Twilight” franchise has come to an end, it’ll be up to KStew to reinvent her image. For inspiration, here are 5 incredible movie stars who transformed their big screen personas:

1. Robert Downey Jr. – Kristen Stewart has a bit of an image problem, but she’s got nothing on RDJ. Rising to fame in “Less Than Zero” and “Soapdish,” his career took a hit and he was nearly waylaid by substance abuse.  After his recovery, his career picked up steam with projects like “Kiss Kiss Bang Bang” and “Zodiac.” These days, he’s a Star with a capital S, playing iconic characters like Marvel’s Iron Man and Sherlock Holmes, and things couldn’t be better.

2. Matthew McConaughey – Having gotten his start in the early ‘90s with “Dazed and Confused,” not so long ago he was stuck starring in films like “Fool’s Gold” and “Ghosts of Girlfriends Past.” Playing the lead in “The Lincoln Lawyer” turned things around, and now he’s having the best year of his career, winning the Best Actor Oscar for “Dallas Buyers Club” and starring in HBO’s critical darling “True Detective.” With a new role in “Interstellar,” from the man behind “Inception,” and a “Magic Mike” sequel in the works, there’s no stopping McConaughey now.

3. Michelle Williams – As a teen, Michelle Williams made a splash as Jen Lindley, the new girl with a dark past on the WB’s fondly-remembered “Dawson’s Creek.” Though the show made the cast household names, Williams – whose previous claim to fame was “Halloween H20” – had the most successful post-“Creek” transition of them all when the show ended in ‘03, starring in Oscar fare like “Brokeback Mountain” and “My Week with Marilyn.”

4. Emma Watson – Emma will probably always be remembered as Hermione Granger, but not because she hasn’t done memorable work since the “Harry Potter” film franchise came to an end. From playing mean girl Nicki in “The Bling Ring,” ethereal Sam in “Perks of Being a Wallflower” and Ila in “Noah,” not to mention her extended cameo as herself in “This Is the End,” Ms. Watson truly is a jack of all trades. And while it’s unlikely, there’s always a chance she’ll cameo in J.K. Rowling’s spinoff trilogy, “Fantastic Beasts & Where to Find Them.

5. Sandra Bullock – There was a time when Sandra Bullock was the Queen of Romance. She was the star of rom-coms like “Miss Congeniality” and “Two Weeks Notice,” while entering slightly more territory with “While You Were Sleeping” and “Hope Floats.” But Sandra proved she had no need for romance in 2009, winning an Oscar for her role in the sports drama “The Blind Side.” Last year, she held her own opposite George Clooney and Melissa McCarthy in two very different movies – “Gravity” and “The Heat,” respectively – and showed that she only gets better as time goes on.

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