EDMONTON — An off-colour tweet by Lady Gaga during her recent tour stop in Edmonton has ruffled a few feathers in the oil city.

The megastar has posted a picture of the massive "This is Oil Country" sign that runs along the catwalk in the upper levels of the Rexall arena.

The problem was, the "o" in country had been removed to set up a light for the show, making the saying more than a little blue.

The singer added the comment "Holy mother of laughter" to her tweet.

Edmonton's mayor wasn't laughing.

Stephen Mandel told a local TV station he thought the joke was in poor taste and reflects more on the artist and her crew than it does the city.

Gaga recently claimed the title of being the most followed person on Twitter, with more than 5.7 million people hanging on her every random thought -- or photo.