Star Tracks: Monday, August 13, 2012

He laid low following Kristen Stewart's cheating scandal, but Robert Pattinson smiles for cameras at Monday's premiere of Cosmopolis at New York City's Museum of Modern Art.

Heidi Klum gives her 5-year-old son Johan a comfortable seat as the always cool-looking pair take a break on Sunday in New York City.

Adam Levine gets tough while goofing off with his fellow Voice judges Christina Aguilera and Blake Shelton during a press junket for the reality singing competition Sunday in L.A.

Maybe a new toy for baby brother Samuel? Ben Affleck and daughters Seraphina, 3, and Violet (not pictured) leave a toy store at a Brentwood, Calif., farmers market on Sunday.

Colin Farrell finds himself in good company with coordinated costars Jessica Biel and Kate Beckinsale while promoting Total Recall in Berlin on Monday.

After a mellow night out with pals last week, Lindsay Lohan heads to the shore for a little RampR in Malibu on Sunday.

Jennifer Lopez is the object of Pitbull's affection as the rapper swoops in for a kiss while performing onstage in Anaheim, Calif., on Saturday.

Katy Perry and John Mayer spend more quality time together, leaving a house party early Sunday morning in the Los Feliz neighborhood of Los Angeles.

Russell Brand performs the Beatles' "I am the Walrus" at the London 2012 Olympic closing ceremony Sunday night.

Lea Michele is on location in New York City to film an episode of Glee.

Pink can't help but gush at hubby Carey Hart and 14-month-old daughter Willow after a Friday lunch date in Malibu with her parents (not pictured).

Fresh off a family vacation in Florida this week, a sun-kissed Gwen Stefani steps out Friday for a solo errand run in Studio City, Calif.

The Duchess of Cambridge gets caught up in the excitement of women's field hockey in London, where she was on hand to watch Great Britain defeat New Zealand 3-1 in Friday's Olympic bronze medal match.

After a visit from the missus at training camp, Tom Brady moves the family bonding off the field, bringing sons Jack, 4, and Benjamin, 2, to a Boston playground on Friday.

Demi Lovato flashes a quick smile while trying to fly under the radar Friday at Los Angeles International Airport, where the X Factor judge caught a departing flight.

While Rachel Zoe's son, Skyler, test drives the toys at L.A. boutique Kitson, his stylish mom helps the 16-month-old do a hat fitting during a Friday shopping expedition.

Think they have a future in law enforcement? David Beckham and his brood of boys – Cruz, 7, Romeo, 9, and Brooklyn, 13 – get acquainted with local police officers at the London Olympics on Friday.