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 video to Instagram on Monday of her posing in nothing but a robe, sneakers, a lacy peach bra and her boyfriend's underwear. 

#His boxers were made for me

A video posted by BELLA (@bellathorne) on

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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

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'