Justin and Hailey Bieber celebrated their first Halloween as new parents, sharing glimpses of the festive day with fans on Instagram.

Two people died and several were injured in a shooting during Halloween night in Orlando. A 17-year old suspect has been arrested. 

From crocheted animals to Taylor Swift, see how caregivers at Cleveland Clinic got their tiniest patients ready for Halloween.

Jordyn Thompson and her friend Lauren Rainey look exactly like Tia and Tamera Mowry.

Heidi Klum and husband Tom Kaulitz unveil a Halloween look that's out of this world.

The professor walked in, took a seat and awaited instruction.

Check out the best celebrity Halloween costumes from Gwen Stefani, Courteney Cox, Kerry Washington, Jennifer Garner and more.

Heidi Klum is known to deliver some of the most iconic costumes for her annual Halloween party.

This Halloween brought unseasonably warm temperatures to the Northeast, with New York tying a record 81 degrees. Philadelphia also tied its record with an impressive high of 82 degrees.

Dayna Isom Johnson shares some fun, last-minute Halloween costume ideas and popular trends.

ABC News medical correspondent Dr. Darien Sutton shares what colored pumpkins mean when trick-or-treating.

Jennifer Garner shared a fun post transforming into her "13 Going on 30" role for Halloween.

A police officer in Ohio was “attacked” by a giant inflatable runaway pumpkin in the middle of the street while he was trying to clear it away from traffic, police said.

From Bobby Pickett’s 1962 song “Monster Mash” to Rockwell’s “Somebody’s Watching Me” rising from the grave every year, more artists are putting out new music to grab a piece of the holiday music pie.

The internet's favorite grandma joins "GMA" to share tips for Halloween tricks and treats.

These three pups from the 34th annual Tompkins Square Halloween Dog Parade are celebrating Halloween in style.

The scariest part of Halloween may be the amount of waste left after the spooky celebrations.

As record-breaking high temperatures were expected Wednesday, snow blanketed the mountaintops of Hawaii and residents of the Great Plains were bracing for tornadoes.

In this Halloween edition of "The Science of You," "GMA" explores why we love the thrill of fear, from scary movies and chilling costumes to haunted houses.

A new dad shares his first Halloween with his daughter in a "Monsters Inc." costume.

A police officer in Ohio was “attacked” by a giant inflatable runaway pumpkin in the middle of the street while he was trying to clear it away from traffic, police said.

"Stop right now!" This family is too cute.

President Joe Biden and first lady Jill Biden, who wore a giant panda costume, hosted trick-or-treaters at the White House on Wednesday for the final time.

MOMbies are a large group of everyday mothers from Fairfield, Connecticut, who dance to raise funds for research on metastatic breast cancer. 

Dancers at Ballet Etudes Academy in Mesa, Arizona, danced in shark costumes to celebrate Halloween.

This postal service worker is delivering holiday vibes this season.

"GMA" lifestyle contributor Lori Bergamotto shares some frighteningly good last-minute costume ideas to help you celebrate the holiday.

"A Nightmare on Elm Street" stars Robert Englund and Heather Langenkamp reflect on the iconic horror film's 40th anniversary in a "GMA" interview.

Chef Zac Young drops by to share how to make last-minute spooky treats just in time for Halloween.

Chef Zac Young drops by "GMA3" to share how to make spooky donuts.

Halloween temperatures in New York, Philadelphia, Boston and Raleigh-Durham are expected to be 15 to 20 degrees above normal. 

We're screaming over this video Jennifer Garner shared going through a haunted house with her 12-year-old son Samuel.

Blake and his family incorporate his wheelchair into his Halloween costume every year, and this year it was to pay tribute to the late Gaudreau brothers.

Blake, 11, also paid tribute to the late Gaudreau brothers with his costume.

Clementine the cat's striking orange eyes added the perfect touch to her bat costume. 

Jennifer Garner shared a funny video with her son Samuel of them going through a haunted house together -- watch here!

Lifestyle contributor Lori Bergamotto shares DIY Halloween décor, food trends and costumes to help get you ready for Halloween.

Unseasonably warm air heading East next week could make for a hotter-than-average Halloween in New York, Philadelphia, the Raleigh-Durham metro area and Atlanta.

ABC News' Will Ganss is helping you get ready for Halloween by looking at the cutest DIY costumes for the kiddies spotted on social media.

Dr. Gary Richter joins ABC News Live to discuss how you can keep your pets safe and happy during Halloween.

Joey Thurman discusses tricks and treats that will help you keep your body healthy and fit during the halloween season.

Gary Kristensen of Happy Valley, Oregon, travelled 45.6 miles over two days in his 1,200 pound pumpkin.

Lifestyle and beauty expert Milly Almodovar talks must-have items for your upcoming Halloween festivities.

Mom lifestyle expert Veena Crownholm shares outfit ideas for your spooky celebration.

ABC News medical correspondent Dr. Darien Sutton shares pumpkin carving safety tips to stay safe this Halloween.

This house in California was all decked out for Halloween and its light display played to the hit by Rockwell.

Staff at the Children's Hospital New Orleans NICU dressed up the babies in honor of Taylor Swift's upcoming concerts in New Orleans.

Beth Fournier is creating her own looks inspired by iconic Disney villains.

Kyle Bostick and his wife Christina went above and beyond with their Halloween decorations at their Garden City, Michigan, home this year.

Henry Hinson dressed up as Eras Tour dancer Kameron Saunders for Halloween.