Selena Gomez may be working on a "secret project," but the 21-year-old singer sure had no problem revealing some other secrets in a sexy Instagram post.

On Tuesday, the "Spring Breakers" actress shared a seductive photo on Instagram, showing off her bottom in a super short all-black sheer ensemble. In the picture, Gomez is gazing into a makeup mirror while playfully teasing her hair. She captioned the flirty shot with "... Secret project."

However, this isn't the first naughty photo that the former Disney star has shared recently. Last week, the "Come and Get It" songstress posed nearly nude in a racy Instagram shot. Ever since she and her on-again off-again boyfriend Justin Bieber started dating again, it seems like Gomez has had no problem with showing off her goods.

On Wednesday, Gomez told a crowd of screaming fans at the first annual "We Day" California event in Oakland about her struggles in her career.

The pop star, who spent time in rehab earlier this year for emotional issues, opened up about her early days acting on Barney.

"When I was 7, I wanted to be an actress and I wanted to live my dream. And when I was 11, I had a casting director tell me I wasn't strong enough to carry my own show," reports USA Today.

She continued, "I'm sure all of you have been told you don't have what it takes and you're not good enough ... but deep down... you want to make something great. It does more than knock the wind out of you. It crushes you."

However, it was her mom who encouraged her to "keep going."

Two years later, "I got my own show," she said.