The "Superstore" actress took to Instagram to share three sets of photos showing off her three Halloween costumes with her more than 291,000 followers.
For "Halloween weekend night 1," Ash opted for a simple Minnie Mouse costume which included black mouse ears, a sparkly black top, a red tulle skirt, fishnet tights and black boots.
"EDM Minnie Mouse! Or 'Molly Mouse,'" she quipped as the caption.
For Saturday night, the 39-year-old dressed up as Britney Spears from her iconic "...Baby One More Time" music video. Ash posed in a flared mini skirt, white button-down shirt, pink bra, grey cardigan and black thigh-high boots, with her hair in braided pigtails.
"Halloween weekend night 2! It’s Britney, b*tch," she captioned the post.
For her third and final look, the Belleville, Ont.-native dressed up as Sandra Bullock's character from the 1994 film, "Speed," complete with a brunette wig, grey cardigan, floral dress and steering wheel.
"Halloween costume #3! Over on the @truecrimeandcocktails patreon, this weekend, @unsolvedchristy and I did a Livestream. We chose the movie 'Speed' as our theme and surprised each other with what character we chose. I think it’s safe to say our commitment to detail was astounding," Ash wrote.
Fans met the actress's photos with praise, dubbing her the "Halloween queen."
"You're the Halloween queen! Love all three costumes. So cute!" one fan commented, while another wrote, "You look adorable!"
"I love that you’re loving yourself and having fun!" someone else pointed out.
One Instagram user added: "I love how festive you are! Love all of your costumes. You killed it!"
"OMG Lauren does the best Britney!" another fan sounded off.
"She’s slaying!" commented another.
Ash was also praised for her festive spirit in early October when she celebrated Canadian Thanksgiving from her home in Los Angeles, Calif.
She shared a series of photos posing in her dining room in a ruched red dress while holding a glass of wine. Ash smiled as she showed off her elaborate holiday meal, alongside decorative pumpkins and floral arrangements.
"Oh, I’ll just throw together a small Canadian Thanksgiving. Haha, right. (Florals by me)," she captioned the photos.
"Staying true to those maple roots. Love to see it. Happy Canadian Thanksgiving to you beautiful!" a fan commented, while another shared, "Happy Canadian Thanksgiving! I still celebrate it, despite living in the United States for almost 20 years."
"Happy Canadian Thanksgiving, a.k.a. the real Thanksgiving!," someone joked. "This looks amazing. Great job!"
"Happy Thanksgiving, you Belleville beauty!" another commented. "I love that you're still celebrating Canadian Thanksgiving from afar. So cute."