Britney Spears narrowly missed an epic embarrassment following a wardrobe malfunction that threatened to 'let it all out' during her show as part of her Las Vegas residency on Saturday evening.

Good thing her backup dancers were faster than Justin Timberlake and managed to rein in the wayward zipper from her sequined top that already exposed her backside and clearly showed that she wasn't wearing any bra.

Like a true professional, however, Britney Spears continue performing "Circus" to the delighted audience.

In 2004, during a Super Bowl halftime show, Janet Jackson exposed her right breast to millions of viewers worldwide in the middle of an electrifying duet with Timberlake.

For somebody who claims to be "shy," the 32-year-old singer appeared to be quite comfortable in clothes that show a lot of skin for her "Piece of Me" residency at Planet Hollywood Resort & Casino.

Her two-year residency kicked off on Friday night attended by around 4,600 people and a handful of celebrities who all sang along the lyrics to her most popular songs such as  "Baby One More Time," "Toxic," "Opps ... I Did It Again," and "Womanizer,"CNN reported.

Despite some fans claiming that they saw her lip-syncing some of the songs, the concert producers claimed that she was actually singing the songs, however the vocals were backed by pre-recorded tracks.

It's understandable considering the pace of the concert as she sings 21 songs, complete with dancing in the backdrop of the elaborate stage, in just under two hours.

CNN said that Britney Spears will take a break from her residency to spend time with her family for the holidays. She will resume the show on January 29 with three shows each week.

The singer was paid $15 million for an estimated 100 total shows for her Las Vegas residency. She joins the likes of Elvis Presley, Elton John and Celine Dion as marquee stars who took up residency at the Strip.