It was all treats and no tricks at Minnesota’s Mall of America, where excited fans witnessed a surprise appearance by Victoria Justice (center) and Thomas Mann (right), stars of Paramount’s new movie “Fun Size.”

 

The stars were joined by “Call Me Maybe” pop sensation Carly Rae Jepsen (left) for a Saturday morning appearance at the mall’s Nickelodeon Universe. The stars greeted fans and signed autographs, while Jepsen debuted the video for her new song “This Kiss,” which is included on the “Fun Size” soundtrack.

 

“Fun Size,” which opens October 26, is the story of a teenage girl  named Wren (Justice) who is invited to a Halloween party by the school hunk (Thomas McDonell), but is forced by her mother (Chelsea Handler) to take her little brother trick-or-treating instead. When Wren decides to go to the party anyway, she loses her brother and must embark on a madcap journey to track him down. The film costars “Suburgatory” actress Jane Levy, “SNL” alum Ana Gasteyer and MTV favorite Johnny Knoxville.

 

Check out more photos of the stars’ Mall of America appearance below.