A few weeks ago, Ava attended the Nurses Ball with Scotty and Kiki, but spent little time with them. Instead of watching the performances, she and Carly spent the evening fighting over a flash drive with a video of Ava having sex with Paul. During these scenes, Ava was wearing a fitted red lace gown with a v-neckline and flared skirt by Jovani. The original version of the dress has a plunging v-back, but Ava's dress was slightly different. My guess is that the costumers added a back panel to form a squarish back neckline to secure the straps in place more effectively during the fight scenes.

Here's a screencap of the back of Ava's dress: