What was Demi Lovato thinking? The former Disney starlet wore a revealing Roland Mouret gown with a plunging neckline on the green carpet of the 2011 Latin Grammy’s held at Mandalay Bay Resort and Casino in Las Vegas, Nevada (more pictures below).

Demi Lovato’s Hot New Red Hair (Twitter PHOTOS)

The 19 year-old “Skyscraper” singer, who recently became a sexy red headed vixen, actually wore her dress backwards. Bad, bad idea. Does Demi even have a stylist? Fire him/her! That was a total disastrous fashion choice – it was inappropriate and tacky! I’m all for taking risks, but this is fashion suicide.

PHOTOS: Demi Lovato & Wilmer Valderrama Caught Making Out

Is Demi trying too hard to look more mature for her new older boyfriend? Even through Demi and actor Wilmer Valderrama did not pose together for photographers, he still opted to wear a shirt that matched her dress perfectly. When asked about his lady friend, Wilmer dodged the question, saying “It’s going to be a great night.”

Thankfully, Demi and Wilmer did not cross paths on the green carpet because that would have become the most awkward “pedobear” moment ever. “That 70’s Show” actor looked extra creepy with dark circles under his eyes. Halloween is over, Wilmer!

Demi Lovato Plunging Neckline/Total Wardrobe Malfunction Pictures

[images: DJDM /wenn.com]