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Dick Van Dyke sings "Mary Poppins" tunes on 90th birthday with flash mob

Dick Van Dyke didn't have just any ordinary birthday this year.

The legendary actor rang in his 90th birthday on Saturday by singing "Mary Poppins" songs alongside a flash mob at The Grove in Los Angeles.

Van Dyke, who played Bert in the 1964 film co-starring Julie Andrews, was on hand to sing "Step In Time," "Chim Chim Cher-ee," "Jolly Holiday" and "Supercalifragilisticexpialidocious." He was joined by a batch of performers dressed like chimney sweeps, similar to his character from the Disney classic.

Afterwards, he posted the video on Twitter, writing: "I am very grateful that at 90 years old, I can still go out and play!!"