Jessica Alba, Chrissy Teigen and John Legend were all tagged in a photo with a zombie bride from the Hayride last week.
"We had a fright tonight," Alba said on Instagram.
Actor Olivia Wilde has been on a pumpkin-carving craze, showing off five of her designs on Instagram.
"I've developed a specific set of skills useful only for Halloween and tunnelling out of a prison cell," she joked on Instagram.
Aussie singer Lisa Origliasso, one half of The Veronicas, and her American boyfriend Logan Huffman have also been carving pumpkins.
They shared a series of photos from a visit to a pumpkin farm last week.
"Look what I picked up at the pumpkin patch," Huffman said on Instagram with a pic of Origliasso in a wheelbarrow.
Canadian actor Jean-Luc Bilodeau, meanwhile, has not been having so much fun.
The Baby Daddy cast member reportedly underwent skin-graft surgery on Wednesday after suffering nasty burns to his arms and legs when his alpaca Halloween costume caught fire at a party.
A spokesperson told New York Post gossip column Page Six that Bilodeau is expected to make a full recovery.
- AAP