f(x)'s Amber spotted in L.A. with Rino & Maryss?

Did f(x)'s Amber make a recent surprise appearance on the Ustream show of SM Entertainment choreographers, Rino and Maryss? The live stream was held in L.A. on October 28th and went on to talk about a variety of topics. Although Amber doesn't make a direct appearance, she's allegedly addressed several times throughout the show, and at some points, viewers are able to hear her voice and see glimpses of her through the webcam. According to tips, Amber makes her first appearance at the 1:09:31 mark, walking through the background as Maryss is talking. A lot of the SM related questions the girls receive from fans are asked directly to the alleged Amber, who cannot be seen as she's assumed to be off to the side, such as whether "Onew is really obsessed with chicken (43:50)" and "what SONE means (32:12)." The girls even include Amber in their age guessing game at 33:24 by asking K-pop fans to guess her age. Maryss later addresses Amber at the 1:08:00 mark by stating, "You're busted already, I don't know why you're hiding." http://www.ustream.tv/recorded/10481877 Source: Ustream Tip: Alex