Bella Thorne poses in lingerie and Tyler Posey's boxers -- see the sexy snap!

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Bella Thorne and Tyler Posey have only been together a month or two, and already they're sharing clothes.

The 19-year-old actress posted a sexy pic to Snapchat on Sunday of her posing in nothing but a robe, sneakers, a lacy peach bra and her boyfriend's underwear. "His boxers," she captioned the snap.

WATCH: Bella Thorne Confirms She's Bisexual to Fans on Twitter

20 PHOTOS
Gregg Sulkin (and with Bella Thorne)
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Gregg Sulkin (and with Bella Thorne)
TORONTO, ON - JUNE 21: Bella Thorne and Gregg Sulkin arrive at the 2015 MuchMusic Video Awards at MuchMusic HQ on June 21, 2015 in Toronto, Canada. (Photo by George Pimentel/WireImage)
HOLLYWOOD, CA - JUNE 29: Gregg Sulkin and Bella Thorne visit The Lowdown with Diana Madison on June 29, 2015 in Hollywood, California. (Photo by Michael Bezjian/WireImage)
BEVERLY HILLS, CA - JUNE 30: Actors Gregg Sulkin (L) and Bella Thorne attend the 6th Annual Thirst Gala at The Beverly Hilton Hotel on June 30, 2015 in Beverly Hills, California. (Photo by Rachel Murray/Getty Images for The Thirst Project)
BEVERLY HILLS, CA - JUNE 30: Actors Gregg Sulkin, Bella Thorne attend the 6th Annual Thirst Gala held at The Beverly Hilton Hotel on June 30, 2015 in Beverly Hills, California. (Photo by Tommaso Boddi/WireImage)
MALIBU, CA - JULY 04: Bella Thorne and Gregg Sulkin attend the 'Red, White And Bootsy' Bootsy Bellows Pop Up At Nobu Malibu on July 4, 2015 in Malibu, California. (Photo by Vivien Killilea/WireImage)
SAN DIEGO, CA - JULY 09: Co-host/actress Bella Thorne (L) and actor Gregg Sulkin speak onstage during the MTV Fandom Fest San Diego Comic-Con at PETCO Park on July 9, 2015 in San Diego, California. (Photo by Kevin Winter/MTV1415/Getty Images for MTV)
LOS ANGELES, CA - JULY 21: Actress Bella Thorne and Gregg Sulkin are seen on July 21, 2015 in Los Angeles, California. (Photo by KeithJMA/Star Max/GC Images)
NEW YORK, NY - JULY 29: Gregg Sulkin and Bella Thorne are seen at JFK on July 29, 2015 in New York City. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 15: Bella Thorne and Gregg Sulkin attend Cameron Monaghan's birthday dinner at The District by Hannah An on August 15, 2015 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)
LOS ANGELES, CA - AUGUST 16: Actors Bella Thorne (L) and Gregg Sulkin pose in the press room during the Teen Choice Awards 2015 at the USC Galen Center on August 16, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - AUGUST 16: Actors Bella Thorne (L) and Gregg Sulkin speak onstage during the Teen Choice Awards 2015 at the USC Galen Center on August 16, 2015 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
LOS ANGELES, CA - AUGUST 16: Bella Thorne and Gregg Sulkin poses in the press room at the Teen Choice Awards 2015 at Galen Center on August 16, 2015 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - AUGUST 30: Actors Gregg Sulkin (L) and Bella Thorne attend the 2015 MTV Video Music Awards at Microsoft Theater on August 30, 2015 in Los Angeles, California. (Photo by John Shearer/Getty Images)
NEW YORK, NY - SEPTEMBER 15: Actors Bella Thorne and Gregg Sulkin attend Diesel Black Gold Spring show during 2016 New York Fashion Week on September 15, 2015 in New York City. (Photo by Joe Kohen/Getty Images)
NEW YORK, NY - SEPTEMBER 15: Nina Agdal, Gregg Sulkin and Bella Thorne attend Diesel Black Gold Spring show during 2016 New York Fashion Week on September 15, 2015 in New York City. (Photo by Jenny Anderson/WireImage)
NEW YORK, NY - SEPTEMBER 16: Bella Thorne and Gregg Sulkin attend the Marchesa fashion show during Spring 2016 New York Fashion Week at St. Regis Hotel on September 16, 2015 in New York City. (Photo by Gary Gershoff/WireImage)
NEW YORK, NY - SEPTEMBER 16: Gregg Sulkin and actress Bella Thorne attend 2015 Harper's BAZAAR ICONS Event at The Plaza Hotel on September 16, 2015 in New York City. (Photo by Gilbert Carrasquillo/Getty Images)
LOS ANGELES, CA - NOVEMBER 29: Bella Thorne (R) and Gregg Sulkin attend a basketball game between the Minnesota Timberwolves and the Los Angeles Lakers at Staples Center on November 29, 2015 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
LOS ANGELES, CA - NOVEMBER 29: Bella Thorne (R) and Gregg Sulkin attend a basketball game between the Minnesota Timberwolves and the Los Angeles Lakers at Staples Center on November 29, 2015 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
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This wasn't the only scantily clad photo that Thorne shared over the weekend. She also posted a topless photo of herself that revealed a huge tattoo of angel wings on her back. The ink is probably temporary as she did not have the tat in the bikini-clad pic she recently posted of herself on top of Posey.

#cats & #tatts

A photo posted by BELLA (@bellathorne) on

Pool vibes with my baby #myman #mcm #mancrusheveryday

A photo posted by BELLA (@bellathorne) on

Last week, Thorne explained to ET why it's important to express herself on social media. "I'm, like, an open book," she said. "But that's what I think that my fans enjoy about me the most, is that they feel like they really know me. And they do, they really f**king know me."

MORE: Bella Thorne and Kian Lawley on Pooping Snapchats and the Intersection of YouTube and Acting

As for whether she's ever crossed the line with her posts, Thorne quipped, "I guess I haven't learned the line of 'too far' yet, because I always do pooping snaps. People always get after me about my pooping snaps. You know what I tell them? ...I don't give a f**k!"

The Famously in Love star is also helping Posey get acclimated to tweeting, snapping and Instagramming. "He doesn't [post] a lot on social media, so it's been... that's like the only thing that's been interesting is [that] I'm so about the socials and he isn't," she said of the 24-year-old Teen Wolf star. "It's a little bit of like, teaching and learning and pushing and pulling."

WATCH: Bella Thorne Straddles Tyler Posey in Racy Bikini Shot, Calls Him Her 'Man Crush Everyday'

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