Demi Lovato: ASOS Lace Dress With Scalloped Neck

Demi Lovato wears this long-sleeved frock with a lace overlay and plunging scalloped neckline

Unfortunately i couldn't find her exact dress
I found a similar bodycon  ASOS Lace Dress With Scalloped Neck you can buy it HERE from ASOS for $54.26
There are many listings of this exact ASOS dress on eBay click HERE to view them. The bids start at $39.99 and have a range of colours.