Bella Thorne goes topless at 20th birthday party, tongue wrestles with YouTube star Tana Mongeau

Bella Thorne had one rowdy birthday bash on Sunday night!

The Famous in Love star celebrated turning 20 with a costume party, and her getup included a whole lot of body makeup that seemed to replace her wearing a shirt. Thorne appeared to be dressed like Batman villain Poison Ivy with ivy leaves in her hair and attached to her large white platform boots. She sported white skinny jeans and a lime green metallic jacket with no shirt underneath, keeping her coat open to show off her glittery body art. 

Bella Thorne topless
Photo: Instagram

PHOTOS: Bella Thorne Rocks Super Sexy Bodysuit and Glitter During Club Night With Scott Disick

19 PHOTOS
Bella Thorne on Instagram
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Bella Thorne on Instagram
Happpppy Sunday ✨😋🍌
Today's vibes ✨💍
#justcall music video is out! Link in my bio ✨💍
Always been around 💦 always want ✌️
Watch where you step
#tca
PAINTING TIME🌈 it's hot as balls outside 💦
Trying to get back in shapeeeee leggo😩
Am I allowed to dress up year round? 🌹🤤
Bring me back rainbow hair 😇
Simple ✨
Happy bb🌈🌸
Casually looking at the foliage in my boxers. Doesn't everyone do this? No 😔 just me..?
Side eye ❤️🔥
Movies + sushi = girls nights ⭐️
Just working on my hygiene .... #happymonday
Wiggly feet @damon_baker
In case you were wondering my bracelet says " dubstep" ✨💙 135,000 streams on @spotify in one day !?! #justcall
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Prior to the party, Thorne showed off her new platinum blonde locks (which she later ditched) with her Instagram followers, writing: "Yes I changed my hair again and yes I'm fuxin 20!!! Let's go Libras met so many people last night that had the same b-day as me ❤️ it was awesome. Happy bday guys!!!"

Even before her birthday, she captioned a selfie, writing: "Last selfie as a teenager? Let's go #20 TOMORROW we RAGE!!!"

Last selfie as a teenager? Let's go #20 TOMORROW we RAGE!!!

A post shared by BELLA (@bellathorne) on

Thorne's pal and rumored love interest, YouTube star Tana Mongeau, also attended the party in costume and the ladies were quite affectionate with one another, exchanging kisses and dancing together.

Mongeau also shared a video on Instagram of her and Thorne tongue wrestling.

"Ur weird, I'm weird, I like u," she wrote. 

Bella Thorne's birthday
Photo: Instagram 

EXCLUSIVE: Bella Thorne Wants People to 'Get Over' Her and Scott Disick, Says She's Got Her Eye on Someone New

This isn't the first time these two have shared a smooch. In September, Mongeau posted a few photos of her and Thorne making out. "Mineeee," she captioned the pics.

Back in January, Thorne admitted to ET that having a relationship has proved difficult for her. "Dating in Hollywood is literally the worst thing," she said. "I'm in photos out with somebody, [and], like, immediately I'm their girlfriend and I've moved in with them too."

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Celebrity nude shots in 2017
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Celebrity nude shots in 2017
comfortable in my rolls. fuck wit me.
Happy day of birth to my son, my whole heart ❤️
So honored to have been photographed by Mert and Marcus for their book new book! 20 years in the making! It's out Sept 7th #mertandmarcus @mertalas @macpiggott #taschen
Cheers to @playboy for going back to nudes. The female body is so beautiful, every size and every age. Be proud! #thefemalebodyisbeautiful #allshapesandsizes #loveyourself #loveyourbody
Hot dog dog. Thanks for chiming in on what you feel I deserve to be paid. I believe women deserve equal pay. However I don't believe I deserve equal pay to Chris and Dave. They are legends and 2 of the greatest comics of all time. I would like to say that I have been selling out arenas these last couple years. Something a female comic has never done. That's a big deal to me, especially because I know I do my best every night on stage for the audience and they have a good time. I didn't ask for the same as my friends. I did ask for more than the initial offer. I will continue to work my ass off and be the best performer I can be. The reports of me "demanding" or "insisting" on equal pay to them aren't a true. #fat #stealsjokes
#54 and clean. Thanks for the birthday wishes!
tock
🌺🌸🌹🌸🌺🌹
i don't smoke
Another day at the office 😛♥️
in Eutopia 🌬🦋💙
Mikey made me do it ... Miami nights 🙌🏻 1. This is my pre DWTS body🦄 2. I am not currently in Miami but am in NYC 3. I posted this knowing most of you would be judgmental and couldn't resist a chance to tear me down and I was right. 4. Go be offended at your own life. 5. I'm living my life to the fullest. ❤️
Just wanted to share that one of the reasons @eatingboys has inspired me so much is because of the way she mixes her humor and sexuality. I spent so many years loving my body but thinking it wasn't lovable by others- its sole purpose was to be fodder for jokes. I performed the insult so no one else could. I don't regret any of it- that's my art and that was my truth- but now, at age 31, having been through hell and back with my health and other people's perceptions of my physicality, I feel deeply comfortable with the idea that this pear-shaped pot of honey is equally good for making people laugh and laying out like a Suicide Girl circa 2004. Love it all.
mother nature
Amore mio
I’ll tell you what freedom is to me. No fear. #NinaSimone
Gold 💛
Something special today 🖤
playing dress up
birthday suit
La Sirena
Mid fitting nap time 😈
I'm very proud to be a part of the March/April issue of Playboy. I penned a short essay along with my pictorial titled, "The Feminist Mystique". A big thank you to @Playboy, the creative team, and @cooperbhefner for such a unique opportunity. #NakedIsNormal
NYC//bed series
Loving you so far 2017. ✌🏻
Thank you @fsseychelles for your outdoor showers, beautiful hospitality, delicious steaks and flying foxes! Shot by my exclusive shower partner @mrjustinervin💦
Nap time = The Best Time 😇🙌🙌
The mystery about my panties... solved! 😂🤣👏🏻. Can u see 🤓 me now?! Lol . The jokes on u🙃🥂 #opticalillusion
🛀🏾🍷🎁 That's what's up #NewSong #NewVideoAlert #BirthdaySong! 🚨🚨 👉🏽#gratitude! Feeling so grateful today! #LinkInBio
Just a typical press day with @mj_day for the launch of @si_swimsuit 2017!!
Simplicity
Angela
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