The Come & Get It singer wore the revealing outfit in New York, where she was making an appearance on David Letterman.
Gomez completed her racy look with a black, high-neck crop jumper, gold-capped heels and a fishtail plait.
The 21-year old seemed on fine form as she greeted fans outside the Letterman studio, with the star earlier breaking down on stage during ballad Love Will Remember.
However, Sel was keen to clear up and speculation that her tears were over Biebs, explaining she was “heartbroken and p**sed” after being banned from speaking to her fans after the show.
Posting a snap of herself with a Brooklyn T-shirt on Instagram, Gomez wrote: “Never ended such a beautiful show in tears because they wouldn’t allow me to Instagram tonight. Completely heart broken and p***ed.
“Thank you SO much Brooklyn. Ill be stopping outside Letterman tomorrow to make it up if you can make it. I love you guys more than you know. Promise.”