Getting into the Halloween spirit, Blake Lively and Penn Badgley were in costume at the Halloween 2033: Adult Playground Event Series at 1Oak in New York City on Saturday (October 31).
For the night’s party, Miss Lively looked sexy as she dressed up as a flight attendant while Penn threw together a last-minute look including a curly wig, headband and casual gear.
Stepping out for the Hollywood holiday happenings, Jessica Alba was all smiles as she made her way to Heidi Klum’s Halloween party at Voyeur in Los Angeles on Saturday night (October 31).
Joined by her hubby and a few friends, the “Sin City” sweetie dressed up as cartoon character “Dora the Explorer” while Cash Warren sported a “Diego” costume.
Keeping things surprisingly low-key, Heidi Montag and Spencer Pratt enjoyed a casual, costume-free Halloween outing on Saturday (October 31).
The “Hills” co-star couple kicked things off with a relaxing lunch in Beverly Hills, with the twosome chatting away on an outdoor patio.
While her baby daughter Stella is a bit too young to take part in this year’s Halloween festivities, that didn’t stop Ellen Pompeo for enjoying the annual holiday affairs.
Spotted out on Saturday (October 31), the Meredith Grey actress was dressed in all-black as she dropped by a local Halloween party before later stopping to get a coffee at a Los Angeles cafe.
Getting into the holiday spirit, Miranda Cosgrove paid a visit to the London Dungeons for Halloween on Saturday night (October 31).
Joined by her mother and a few pals, the “iCarly” cutie was all decked out in a cat costume as she enjoyed the haunted grounds.
Earning a little extra cash with hosting duties, Holly Madsion was in full costume as she hit up Studio 54 in the MGM Grand Resort Hotel in Las Vegas on Saturday night (October 31).
Joined by fellow beauty Laura Croft, the Playboy babe was on-hand to make sure partygoers had a night to remember as they celebrated during the Hollyween fete.
Enjoying their first Halloween as a married couple, Khloe Kardashian and Lamar Odom were among the stars taking part in the night’s festivities in West Hollywood on Saturday (October 31).
The E! reality star and her Lakers basketballer hubby dressed up as Batman and Catwoman for a big bash at Club XIV.
Making for quite the sight to be seen, Gwen Stefani and Gavin Rossdale were spotted out alongside their sons, Kingston and Zuma, in Los Angeles on Saturday evening (October 31).
The foursome stepped out dressed in cute costumes (aside from Gavin) to collect a few bagfuls of goodies as they went door-to-door for the Halloween holiday trick-or-treating session.
Getting into the Halloween spirit, Kate Beckinsale, Len Wiseman and daughter Lily Mo Sheen were all dressed up in Los Angeles on Saturday night (October 31).
After spending the day out shopping in Santa Monica, the happy family posed for pictures as they left their house, en route to a local Halloween party.
Always in the mood for a night of partying, AnnaLynne McCord was once again helping sister Rachel celebrate her 21st birthday at TABU Ultra Lounge inside the MGM Grand Resort Hotel in Las Vegas on Saturday night (October 31).
Making for Rachel’s second birthday bash in the past few days, the most recent soiree was an appropriately themed Halloween fete – with all three McCord girls decked out in their costumes.