Star Tracks: Thursday, June 17, 2010

Still flaunting her sexy new look, Miley Cyrus makes her way to the Late Show with David Letterman in New York Thursday. Despite her growing photo scandal, the singer told Ryan Seacrest she's just focusing on "the positive."

Kristen Stewart ditches her famed Bella bite for a bright smile Thursday, striking a picture-perfect pose with Taylor Lautner during a photocall to promote Eclipse in Rome.

He may be hiding his beach-ready bod, but Zac Efron is still picture-perfect on Wednesday while accepting the Shining Star Award at the 2010 Maui Film Festival in Wailea, Hawaii.

Following an intimate French dinner with friends earlier in the week, Renée Zellweger and beau Bradley Cooper resurface on Wednesday near Paris's chic Champs-élysées.

Nicole Richie adds some glitz to the Pitt Street Style Space VIP event on Thursday at Sydney's MidCity Centre.

After wrapping the last Harry Potter film, Daniel Radcliffe reunites with costars James and Oliver Phelps, Bonnie Wright and Rupert Grint for the grand opening of The Wizarding World of Harry Potter at Orlando's Universal Studios Wednesday night.

Jersey Shore star Nicole "Snooki" Polizzi stops by Dr. Sanford Siegal's New York office Wednesday to exchange style tips and discuss his too-good-to-be-true cookie-based diet, which she's endorsing.

The boys are back! Entourage stars Kevin Dillon, Jeremy Piven, Kevin Connolly, Jerry Ferrara and Adrian Grenier huddle up in Hollywood on Wednesday at the season 7 premiere of their HBO hit, which returns to TV on June 27.

She's single and ready to mingle! Cameron Diaz flies solo Wednesday at the premiere of Knight amp Day in Seville, Spain. The action flick, costarring Tom Cruise, opens in theaters June 23.

Beyoncé and Jay-Z show fans the love Wednesday during a UJA-Federation event honoring Atlantic Records execs Julie Greenwald and Craig Kallman at New York's Pierre Hotel.

Tori Spelling cuts a slim figure (in frock! by Tracy Reese) while promoting her new tell-all, Uncharted TerriTORI, on The Today Show in New York on Wednesday. In the book she tackles difficult topics including her drastic weight loss.

Bride-to-be America Ferrera flaunts her new ring on the red carpet Wednesday at the Edinburg Film Festival screening of The Illusionist in Scotland.

Prince William chats up pop royal Joe Jonas Wednesday in Maun, Botswana, where both are on charity trips. Back in England, a palace spokesperson told PEOPLE that pregnancy rumors involving William's girlfriend, Kate Middleton, are "complete nonsense."

What's black and white with cherry-red on top? Rihanna! The singer shows off her bold airport style shortly after deplaning in her native Barbados.

Backstreet Boys Nick Carter and Howie Dorough reunite offstage at Mohegan Sun’s Ultra 88 nightclub in Connecticut, where Nick deejayed until last call. The band – minus original member Kevin Richardson – are currently touring on behalf of their new album, This is Us.