- (PHOTO:Twitter/Justin Bieber)
Canada Day 2013 arrived Monday, marking the 146th anniversary of Canada uniting its three colonies in a single country within the British Empire.
On July 1, 1867, the British North America Act was passed. However, today, is it called the Constitution Act, 1867.
Originally known as Dominion Day, it was renamed Canada Day in 1982. Canadians celebrate "Canada's Birthday" across the nation, while Canadians who live internationally also hold observances.
In Ottawa, over 350,000 Canadians are expected to converge on Parliament Hill for Canada Day festivities.
Festivities are also scheduled for cities including Vancouver, Calgary, Regina and Toronto, among many others.
Many Canadians are celebrating Canada Day by enjoying Canadian-brewed beer Molson or, despite the summer season, playing its national winter sport: hockey.
Many of today's top celebrities hail from Canada, including pop superstar Justin Bieber and Hollywood favorite Ryan Gosling. Both leading men were born in London, Canada.
Actors Ryan Reynolds and Rachel McAdams are also Canadian, as are singers Joni Mitchell, Neil Young, and Carly Rae Jepsen as well as rapper Drake.
Furthermore, "Revenge" television star and Canada native Emily VanCamp wished her Twitter followers a Happy Canada Day on Monday. The actress is from Port Perry, Canada.
Also taking to Twitter with Canada Day were thousands of online users, and "Happy Canada Day" became a trending topic on the social media site all day long on Monday.
"Happy Canada Day everyone," started Mariana. "We are extremely lucky to live in such an amazing country. Group hug for everyone."
Comedic Twitter account Vodka Vendettas mentioned a famous Canadian, writing, "Happy Canada Day! We'll honestly never be able to repay you for Ryan Gosling."
Meanwhile, Americans are gearing up for the 235th celebration commemorating the United States' adoption of the Declaration of Independence on July 4, known as Independence Day.