The photo shows her with a healthy bust, on the verge of falling out of her mini crop top.
While some people were quick to claim they could see her nipple, others were sure she'd had a boob job.
Lea Michele's recent story about the pressure she was put under at an incredibly young age to get a nose job makes the whole idea sadly plausible.
However, we're hoping that at just 21 Selena hasn't gone under the knife like so many other celebrities.
It appears from other photos that she's simply got quite the enviable natural figure.
What do you think, has Selena had a boob job? Tweet us @handbagcom
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