'Tis the spooky season.

Hollywood stars got into the Halloween spirit as celebrities dressed up to impress for the holiday.

Jennifer Garner, Kelly Clarkson, Selena Gomez and more portrayed nostalgic yet iconic movie characters, while other A-listers appeared in original and unique costumes.

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Garner travels back in time with her iconic “13 Going on 30” costume.

Garner, 52, revived her nostalgic character Jenna Rink from the popular romantic comedy.

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She took to Instagram to recreate her role as she wore a butterfly necklace and twirled in her colorful dress to Whitney Houston's “I Wanna Dance with Somebody.”

“Happy 20th Halloween, Jenna Rink,” Garner’s social media caption read.

The popular film “13 Going on 30” was released in theaters in 2004.

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Say Kelly Clarkson three times and she appears as Beetlejuice.

The “Breakaway” singer transformed into Michael Keaton's Beetlejuice character as she rocked the black and white striped suit, signature wild hair and spooky skin.

Clarkson incorporated the cult classic into her talk show by performing a version of “Banana Boat (Day-O),” the Harry Belafonte song featured in the iconic scene from the original 1988 film.

Kelly Clarkson transformed into Michael Keaton's Beetlejuice for her talk show. (Weiss Eubanks/NBCUniversal)

Luke Wilson reprized his famous role of Emmett Richmond in Legally Blonde, where he only had to wear a suit and tie.

Luke Wilson reprized his famous role of Emmett Richmond in Legally Blonde. (John Nacion/Getty Images)

Wilson, 53, made a surprise appearance on the “Today” show while host Savannah Guthrie dressed as Reese Witherspoon's character Elle Woods.

Wilson made a surprise appearance on the “Today” show with host Savannah Guthrie dressed as Reese Witherspoon's character Elle Woods. (John Nacion/Getty Images)

Former Disney star Selena Gomez dressed up as Alice from Alice in Wonderland, along with her boyfriend Benny Blanco as the Mad Hatter.

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Anne Hathaway was a spooky version of the Big Apple.

“The Princess Diaries” star took to social media to share her costume: She wore a Statue of Liberty crown, a white wig, spooky makeup and a T-shirt that read “Boo York City.”

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Dolly Parton whipped up a sweet Halloween treat for the holidays.

Dolly Parton dressed up as a witch while cooking something in the kitchen. (Dolly Parton/Instagram)

The “9 to 5” singer dressed up as a witch as she shared her Witches' Brew Cider with her sister. Parton wore a floral witch hat and an orange and black dress decorated with fall leaves.

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Alec Baldwin and his family got into the Halloween spirit by dressing up as Where's Waldo.

“Happy Halloween from the Bald Waldos to you!” said his wife Hilaria on Instagram.

Alec has eight children and has been married twice. He married his current wife Hilaria in 2012 and the couple have seven children together.

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Demi Moore looked truly unrecognizable as she shared behind-the-scenes photos from her new film The Substance.

Moore plays Elisabeth Sparkle, a character who transforms into an enhanced version of herself when a laboratory offers her a substance in the film.

Moore's frightening look included that she was bald and had a few strands of gray hair on her scalp. Her makeup had a lot of wrinkles and her body was shrunken in her post. The final photo on Instagram showed Moore with blood all over her face.

Demi Moore looked truly unrecognizable as she shared behind-the-scenes photos from her new film The Substance. (Demi Moore/Instagram)

Sami Sheen, 20, flew as a Victoria's Secret angel this Halloween.

The daughter of Denise Richards and Charlie Sheen flaunted her fit body in risqué white lingerie and large matching angel wings.

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She completed her look with a pink satin robe from Victoria's Secret and sparkly heels.

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Heidi Klum's 20-year-old daughter Leni dressed up as Pamela Anderson for the spooky holiday.

“Our version of Tommy and Pamela,” Leni’s Instagram caption read.

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The model wore a platinum blonde wig alongside her punk rock boyfriend.

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Kelly Osbourne's costume was out of this world.

The English television personality wore a silver astronaut suit and helmet while her son Sidney dressed up as an adorable neon green alien.

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Kelly Osbourne wore a silver astronaut suit and helmet. (Kelly Osbourne/Instagram)

Kelly Ripa turned out to be a real Swiftie for Halloween.

Kelly Ripa dressed as Taylor Swift and her husband Mark Consuelos was NFL player Travis Kelce. (DISNEY/Jeff Neira/Gotham/GC Images)

The TV host dressed up as Taylor Swift because her husband Mark Consuelos was NFL player Travis Kelce. The couple wore Swift and Kelce's outfits for their appearance at the US Open.

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