Joanne Peh wears daring plunging V-neck top for Christmas tree lighting in Orchard -- or does she?

Celebrities sparkled as brightly as the 21m-tall Christmas tree unveiled by Louis Vuitton outside Ion Orchard on Nov 15 evening.

Among the glitterati was actress Joanne Peh wearing what appeared to be a revealing low-cut top.

After she posted images of herself at the event on Instagram, netizens commented with adjectives such as "stunning" and "sexy".

But other comments were less flattering.

One netizen remarked: "Oh my, that white dress isn’t really fitting and unsightly."

Another said: "Very self-confident to wear this outfit. Lots of fashion tape I bet. Victim of fashion or leader of fashion."

To which Peh herself replied jokingly: "Who needs tape when I have posture?"

The not-so-secret secret is that what she wore was not what it seemed.

The top half of her LV jumpsuit actually has a "sensual sheer insert on the chest to create a daring plunging V-neck effect", to quote the fashion brand's website.

If you fancy one for yourself, it retails at $8,350.

Other celebs who graced the festive tree-lighting ceremony included Zoe Tay, Fann Wong and Christopher Lee.