Selena Gomez Poses in Nothing but Her Bra and Tights

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Don't let her baby face fool you -- Selena Gomez is all grown up.

The 23-year-old former Disney star struck a sexy pose on Instagram on Thursday, sporting nothing but her black bra and a pair of sheer tights. Selena's been teasing a special fan event on Sep. 16 to celebrate the release of her new album, Revival.

"You guys can still sign up for my little REVIVAL event in September because I wanna meet yall and share some stuff so.... #thealbumscomingggg #REVIVAL," she wrote.

WATCH: Selena Gomez Posts Underwear Pic, Reveals Why She No Longer Wears a Purity Ring

Selena has had zero problem showing a whole lot of skin lately, rocking a daring dress featuring two thigh-high slits at the MTV Video Music Awards last Sunday.

She even posted an underwear selfie last week, which has since been deleted.

Presumably, Selena will also be playing a more grown-up role in Seth Rogen and Zac Efron's upcoming Neighbors 2. The actress plays a sorority sister in the sequel to the 2014 film, and was recently spotted filming in a hot pink bandage dress on set.

This can't be making Justin Bieber happy, given that Rogen memorably called the 21-year-old singer a "piece of s**t during his appearance on Howard Stern's SiriusXM show in May.

"When I met Zac Efron, one of the most endearing things is that he recognized that he as a Disney star, and I as a man in my late 20s/early 30s, would fu*king hate him. Why wouldn't I?" Rogen joked. "Justin Bieber had zero percent of that. No humility, no awareness, no sense that, 'Since I appeal to young, young people, maybe a grown man who works in comedy doesn’t give a sh*t about me? And maybe I should act in such a way that maybe this isn't the greatest experience of his f*cking life to meet me?' And I just remember thinking he's a piece of sh*t."

WATCH: Selena Gomez Looks Happy and Stunning on the Set of 'Neighbors 2'

But does Justin still carry a torch for Selena? Though they've officially been over for a while now, he's surprisingly called her out in both of his most recent music videos for "Where Are U Now" and "What Do You Mean?"

Watch below:

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