The new Pitch Perfect 2 trailer is out and not only is it funny, fans are also in for a surprise from Australian actress Rebel Wilson.

The trailer starts with Rebel performing Miley Cyrus' hit song, "Wrecking Ball" dedicated to the US president.

However, as Rebel, wearing an ultra-tight black and gold latex body suit, descends from above and onto the stage, her body suit suddenly rips and viewers are shocked when they learn she is not wearing any underwear.

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John Michael Higgins, who plays the role of John Smith, a commentator for the ICCAs can be heard saying, "Oh no, she has no underwear on. We have a commando situation," as the funny "Fat Amy" hangs upside down and slowly turns to the audience's view, whose facial expressions were beyond priceless.

Fat Amy's hysterical stunt made national headlines that a journalist reports about the incident and says, "The Australian singer gave the president a birthday gift from Down Under."

Pitch Perfect 2 still follows the acapella group, Barden Bellas. However, this time, it is led by Anna Kendrick's character, Beca. The group joins and hopes to win an international singing competition where no American group has ever won before.

Just like the first Pitch Perfect flick, which by the way, was an extreme hit, the movie promises a lot of singing, dancing, as well as some "pitch slapping."

When the Barden Bellas learn that they have been suspended and that a European team has taken their place, they realize that they have to do something radical to re-claim their spot.

They compete in a rap battle led by Fat Amy with the European team who thinks that they have no chance and insists that they retire.

Beca, who is confronted by one of the European team's members then declares World War Two on their rivals, as viewers are shown a few clips of the Barden Bellas performing Beyonce's "Run the World" on stage.

Brittany Snow, Skylar Astin, Ben Platt and Adam DeVine reprise their roles as Chloe, Jesse, Benji and Bumper, along with Rebel and Anna.

Hailee Steinfeld is also featured in the movie as Emily. Elizabeth Banks, not only comes back as a commentator alongside John, but is also the director of the film.

Pitch Perfect is set to be released in Australia on May 7, in the US on May 15 and in Asia starting on May 13.

Tagspitch perfect 2, Rebel Wilson, Anna Kendrick, Pitch Perfect 2 Trailer