New Year's Eve: Ariana Grande shares Ethan Slater selfie, Mark Ruffalo reflects on a 'rough' 2024

With less than 12 hours until we ring in 2025, celebrities are reflecting on their rollercoaster year of 2024.

It was a year that included a presidential election, a "brat" summer, near-daily lawsuits leveled against Sean "Diddy" Combs, a rap beef between Kendrick Lamar and Drake, the downfall (yet again) of Bennifer 2.0 and so much more that we'll likely forget by Jan. 1.

But beyond the headlines and online discourse, celebrities lived their life offline and are spending New Year's Eve looking back.

"Picture Perfect" star Rebel Wilson reflected on the heartache and struggles this year brought, "Stranger Things" actress Millie Bobby Brown is reminiscing on becoming a married woman and "Poor Things" actor Mark Ruffalo wants to "lean on community, kindness and hope" in 2025.

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Ariana Grande shares rare photo of 'Wicked' co-star Ethan Slater

The "Wicked" star took New Year's Eve to look back at a "year full of art and heart."

Sharing a series of photos of herself at Disneyland, in the studio, on the set of "Wicked" and more, Grande thanked fans for their support in 2024. "thank you eternally for your love and support, words truly don’t suffice. i love you always and am wishing you a all a very happy new year !" she wrote in the caption.

Grande also managed to sprinkle in a photo of her and rumored boyfriend Ethan Slater. He's featured in a black-and-white selfie with their "Wicked" co-star Jeff Goldblum.

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Grande's brother Frankie Grande commented under his sister's post and celebrated her "beautiful gorgeous incredible year."

He added: "So happy to have made so many beautiful memories together and get to watch you beam your light out all over the world in the most brilliant ways. I love you so much. Happy new year Ari."

Celine Dion sends a 'heartfelt thanks' for fans' support

The French singer isn't taking the "unwavering support" from fans for granted.

"As we wrap up another year together, I want to take a moment to express my heartfelt thanks for your unwavering support," Dion wrote on Instagram. "Your love and energy inspire me every day. I wish you all a joyful holiday season filled with warmth, laughter, and cherished moments with loved ones."

This year, the 56-year-old returned to the stage for the first time since revealing her stiff-person syndrome diagnosis in 2022.

Dion concluded: "Here’s to endless possibilities in the coming year. Wishing you a safe holiday and a fabulous New Year!"

Mark Ruffalo reflects on a 'rough' 2024

The "Avengers" actor on Tuesday shared a photo of himself lounging shirtless on a white couch and looked back at the year he's had.

"2024 was rough, no way around it," Ruffalo captioned his Instagram post. "As we move into 2025, let's lean on community, kindness, and hope—and remember that rest is necessary for the road ahead."

He concluded: "Here's to brighter days and taking care of each other. Happy New Year, friends. ✨"

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Mindy Kaling shares snippets of her 'fun and sometimes stressful' year

The former "Office" star shared an Instagram Reel that featured video snippets from each month of the year, one of them including a never-before-seen photo of her baby bump. (In June, Kaling revealed she had given birth to her third child after her pregnancy was kept under wraps.)

"Bye 2024! You were so fun and sometimes stressful?" the "The Sex Lives of College Girls" creator wrote in the caption. " But I learned SO MUCH and it was the last time I will have to use that medela pump on a plane!"

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Millie Bobby Brown reminiscences on her 2024 wedding

The "Stranger Things" actress kept her 2024 reflections short and sweet on Instagram, simply writing: "the year of mrs bongiovi 🤍."

Brown, who quietly wed to Jake Bongiovi in Italy earlier this year, shared an Instagram Reel featuring various snippets from a whirlwind year that included her many travels, dance and singing sessions with friends and rare footage from her wedding.

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Rebel Wilson is 'pumped to bring in 2025'

The "Senior Year" actress is ready for what 2025 has in store.

"So pumped to bring in 2025! 🎆 What a year 2024 has been! Got married to my gorgeous Disney princess, my little girl is already a little lady, my memoir REBEL RISING was a New York Times Best Seller, the movie I directed had a huge gala premiere at Toronto Film Festival and I got to have some amazing adventures around the world with friends," Wilson captioned her post, which featured two photos with wife Ramona Agruma and their daughter Royce Lillian, born in 2022.

Aside from the peaks of 2024, Wilson also reflected on the valleys it brought including "some heartache this year" and "some struggles."

While she didn't elaborate, Wilson also seemingly referred to the allegations she made against Sacha Baron Cohen of bullying and gaslighting in her memoir. She wrote on Tuesday in her caption, "Having crisis PR teams pump absolutely rubbish for their client's agendas is INSANE and not a fun thing to go through but the cream always rises to the top!"

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Wilson continued: "I'll keep working hard, moving forward, so so grateful for all the amazing blessings I have in my life 💜 thank you to everyone here on Insta for being so lovely and supportive! I adore you all! Thank you for writing to me and sharing your life with me. Rebel xoxo."

Jessica Alba looks back at a year 'filled with connection'

The actress and entrepreneur is feeling gratitude for 2024.

"Here's to a colorful past year that was filled with connection, growth, adventures, laughter, peace, sisterhood, transformation, rebirth, joy and so much love 🙏🏽 " Alba captioned a series of photos and quotes on Instagram. "Sending hugs to everyone going through it- cheers to 2025 and even more love to come! Let’s goooo! 😘💫🐍🥂 #2025 #YearOfTheSnake #HappyNewYear"

Alba also gave a nod to the Chinese lunar calendar and expressed her excitement for the Year of the Wood Snake, which starts Jan. 29, 2025, and will end on Feb. 16, 2026.

"The Year of the Snake teaches us profound self-improvement, encouraging growth from within and expanding our consciousness," Alba shared in her Instagram caption. "It reminds us that becoming a better version of ourselves allows for greater flexibility, shedding rigidity, and embracing transformation."

This article originally appeared on USA TODAY: New Year's Eve: Ariana Grande's boyfriend Ethan Slater, more celebrate