A music superstar dropped into Kamloops on Easter Sunday, causing a frenzy without even raising her voice - or her sunglasses.Pop sensation Rihanna took her Diamonds world tour to Canada earlier this month, and while travelling from Calgary to Vancouver on Sunday, her tour bus stopped at the Kamloops Walmart.At around 1:30 p.m., Maddy Ferguson tweeted that she'd spotted two tour buses in the store's parking lot and hoped to see the rapper A$AP, who is also on Rihanna's tour.When Ferguson scoped out the store, she saw Rihanna and took a clear cellphone shot of the pop star facing the camera with a slight smile and wearing headphones, a backwards ball cap and sunglasses."I thought it was A$AP but Rihanna is pretty cool too," she tweeted.Other photos were also posted showing Rihanna walking through the store and walking back to her tour bus while carrying a McDonald's beverage.Some reports stated she bought a soda at the restaurant and made a donation to the McHappy Day charity.Her appearance created a buzz among bloggers and tweeters from as far as France and Brazil - all of them mentioning Kamloops.Walmart manager Tim Labermeyer confirmed Rihanna had shopped at the store, reportedly picking up some "comfort food."Labermeyer said the store's staff is used to seeing familiar faces since NHL hockey players with family or cabins in the area drop in throughout the summer.But the excitement Rihanna generated left him stunned."It was funny, I was actually at home having an Easter brunch and my 14-year-old daughter got a text from her friend saying 'Oh my God Rihanna's in Walmart!' So then she freaked out."He said that excitement hasn't stopped since as he dealt with phone calls from media and his central office.Meanwhile, Ferguson got the full scope of the frenzy her photo created as it was disseminated throughout celebrity, gossip and fan websites.She also got a taste of the darker side of fame."It's absolutely hilarious how many people are saying that the picture I took yesterday is fake or a hoax," she tweeted.