1 of 15
2 of 15
Hayden Panettiere, who turns 18 Tuesday, sparkles as she receives a bouquet from admirers Monday outside the Late Show studio in New York, where she stopped by to chat about the upcoming second season of Heroes.
3 of 15
It may be catty onscreen, but in real life Ugly Betty costars America Ferrera and Michael Urie share a happy reunion at the season one DVD release party for their show at L.A.'s Skybar on Monday.
4 of 15
BAND OF BROTHERS
A possibly engaged Joel Madden and his brother Benji make their exit from the MTV Live studio in Toronto after a Good Charlotte appearance on the Canadian version of TRL on Monday.
5 of 15
THE TWO STEP
Also in town for an appearance on MTV Canada: The Hills stars Lauren Conrad and Audrina Partridge, who take a break from promo duties to dine at Toronto's Ultra Supper Club on Monday.
6 of 15
Sopranos star Vincent "Big Pussy" Pastore breeds good will between all species at the launch of the Meow Mix-sponsored "Acatemy" in New York City on Monday. The traveling "school" aims to purr-fect better communication between felines and their human owners.
7 of 15
Fresh off her weekend beachside barbecue, Paris Hilton gets right back to the Hollywood nightlife, hitting up L.A.'s Hyde Lounge with a gal pal on Monday.
8 of 15
THE HIGH LIFE
Kelly Clarkson, who admitted to eating a marijuana cookie in Amsterdam but not smoking the drug, jokes around during an appearance Monday on MuchOnDemand in Toronto.
9 of 15
Babyshambles frontman Pete Doherty gets his walking papers as he leaves a London court Tuesday a free man, after charges stemming from a bail violation were dropped.
10 of 15
WHAT HAPPENS IN VEGAS…
...Stays in New York! Though Cameron Diaz enjoyed a cozy weekend with John Mayer, she happily reports to work Monday on the set of her new movie What Happens in Vegas…, which is filming in the Big Apple.
11 of 15
ANOTHER MANIC MONDAY
Meanwhile, Diaz's weekend companion, John Mayer, jumpstarts his Monday morning with a cup of coffee as he heads to a downtown gym in New York.
12 of 15
Can anyone spare a franc...or euro? Steve Martin makes like his Pink Panther character Jacques Clouseau and inspects an expired parking meter during filming of The Pink Panther 2 in Paris on Monday.
13 of 15
Continuing with her summer getaway, Sienna Miller finds a beach buddy in Welsh actor Rhys Ifans as the two head to the shore in Ibiza, Spain, on Saturday.
14 of 15
After helping dad Ben ring in his 35th birthday, Violet Affleck, 20 months, shows mom Jennifer Garner her sweet cheeks during an outing in Los Angeles on Sunday.
15 of 15
EYE OF THE BEHOLDER
Jessica Alba, who may have split with longtime boyfriend Cash Warren, takes her two remaining guys – pug Sid and pit bull Bowie – out for a stroll during a break from filming The Eye in Vancouver on Saturday.
More on Jessica:
See the latest photos, news and a full bio
Céline Dion a Year After Husband's Death: 'I Have to Stand Tall and Strong'
Bindi Irwin Posts Adorable Goodbye Message to Boyfriend Chandler Powell — Read Her Sweet Note!
Donald Trump to Remain an Executive Producer on Celebrity Apprentice
Shannen Doherty Praises Members of Her Medical Team as She Undergoes Another Round of Radiation
Sorry, Mom and Dad! Jimmy Kimmel Says 'I Forgot to Tell My Parents' About Hosting the Oscars
Who Almost Had a Janet Jackson-Style Wardrobe Malfunction at Hairspray Live!?