The 'Burn' singer decided to combine giving her fans a treat and thanking jeweller Lynn Ban for her new necklace with this sultry image, uploaded on Tuesday night (21 January).
"Thank you kindly Lynn Ban for this gorgeous, gorgeous necklace," she wrote alongside the image, which was taken in New York.
One cheeky Instagram follower replied: "Necklace ?.. Oh yeah didn't even notice a necklace."
Ellie jetted to New York at the weekend to promote her single 'Burn', which is climbing the charts there, and her album Halcyon.
She made an appearance on The Late Show with David Letterman last night, and will be on Good Morning America today.
It's snowing heavily in New York at the minute but Ellie, 27, braved the cold with bare arms as she turned up to tape Letterman.
Brrr. We're slightly cold just looking at her...
Watch Ellie's video for 'Burn' below: