Star Tracks: Tuesday, August 3, 2010

Katy Perry sports a bikini (on top!) Monday during a press conference for Singapore's three-day concert series, SINGfest 2010. The "California Gurls" singer kicks off the event tonight, while Kanye West hits the stage tomorrow.

Good pick! Former Bachelorette Ali Fedotowsky walks hand-in-hand in Hollywood with her now-fiancé, Roberto Martinez, on Monday. The former Facebook employee accepted Martinez's marriage proposal on the TV show's finale Monday night.

Eva Mendes is just one of the guys on Monday, joining dapper costars Mark Wahlberg and Will Ferrell for the New York City premiere of their latest film, The Other Guys. The cop comedy hits theaters this Friday, Aug. 6.

Coming through! Naomi Watts wheels her three-year-old son Alexander (nicknamed "Sasha") around the Big Apple on Monday.

Glee's leading lady Lea Michele hits a style high note on the red carpet at the Fox 2010 TCA All-Star Party in Santa Monica, Calif., on Monday.

Get secrets from Glee's second season at TV Watch!

Khloe Kardashian and husband Lamar Odom make a perfect match Monday night at Casio's "Shock the World 2010" watch launch at New York City's Manhattan Center.

Meanwhile, inside the Casio event, Ke$ha (with some unlikely stagehands – check out that skeleton!) gets the party started with a super-glittery performance.

Is this some sort of extreme magic trick? Illusionist David Blaine, alongside actor pal Woody Harrelson, hit the road in their motorcycles on the streets of N.Y.C. on Monday.

After reportedly being arrested for public drunkenness on Friday, Nicole "Snooki" Polizzi lays off the booze, digging into a slice of pizza instead while filming season 3 of Jersey Shore in the Garden State on Tuesday.

Kendra Wilkinson doesn't leave her fans waiting for long after finishing a taping of The Wendy Williams Show in New York City, where she promoted her best-selling memoir Sliding into Home on Monday.

Engaged couple Joel Madden and Nicole Richie, who admit they haven't started their wedding planning, keep things casual during a stroll in Beverly Hills on Monday.

Ahoy, matey! After debuting the new season of Project Runway, Heidi Klum takes in the sea breeze with Seal and her kids – including 4-year-old Henry – during a boat ride in Saint-Tropez on Monday.

A day after toasting the Hoff, PETA spokeswoman Pamela Anderson turns her attention to animal life in New Orleans on Monday, helping to find homes for canines affected by the BP oil spill.

Caffeine's getting a big boost! George Clooney lends his movie star charm to coffee company Nespresso during an overseas commercial shoot in Milan, Italy, on Monday.

Can you hear him now! Russell Brand continues debuting one funny costume after another on the N.Y.C. set of Arthur on Monday.