Canadians poured out their best wishes and love for Queen Elizabeth on Thursday, as the monarch marked her 90th birthday.

Prime Minister Justin Trudeau wished the Queen "continued happiness for years to come," in a tweet sent out on Thursday morning.

The PM also acknowledged the Queen's birthday in a statement, saying that she has served on the throne "with dignity, wisdom and grace."

"Over the past 64 years, Her Majesty has stood with Canada through key moments of our country's history and, as our nation underwent change and transformation, has been a rock of stability and a steadfast keeper of tradition.

"Today we admire her devotion to duty, and are thankful for her deeply-held affection for our country and unwavering loyalty to all Canadians."

Official Opposition leader Rona Ambrose hailed the Queen in a separate statement, wishing her a happy celebration with family and friends.

"Over the 64 years of her reign, the Queen has earned great respect, affection and admiration of Canadians and people all over the Commonwealth," Ambrose said in a statement.

Former prime minister Stephen Harper also offered his best wishes to Queen Elizabeth. Harper thanked the Queen for her "enduring service to Canada and the Commonwealth," in a series of tweets.

Canadians send birthday wishes

Many celebrations for the Queen's birthday took place across Canada. Toronto's Fairmont Royal York Hotel, which has hosted the Queen in the past, held birthday celebrations throughout the day, with English tea and a few of the Queen's favourite beverages on the menu.

In Alberta, the province announced a new walking trail in Banff, as a tribute to Elizabeth. The Commonwealth Walkway through Banff National Park will be unveiled in September 2017, in time for Canada's 150th anniversary.

Many Canadians turned out for parades, tea parties or public gatherings, while others turned to Twitter to send their wishes to the monarch.

A few shared historical photos from the Queen's various visits, including the following one of her standing with former Gov. Gen. Ray Hnatyshyn, in 1994.

With files from The Canadian Press