Keith Richards is celebrating two new milestones -- his 80th birthday and his 40th wedding anniversary.

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The Rolling Stones guitarist turned 80 years old on Monday and also marked 40 years of marriage with his wife, Patti Hansen.

The Rolling Stones honored Richards with a tribute on social media.

"Happy birthday to the one and only @officialKeef! Wishing you the most special of days Keith! Keep on rocking," the post reads.

Fellow musician Slash also wished Richards a happy birthday online.

"Happy Birthday #KeithRichards," the Guns N' Roses guitarist said on Instagram.

Richards himself marked his 40th anniversary with Hansen by sharing a throwback photo from their 1983 wedding, which fell on his 40th birthday.

"For Patricia, Happy 40th Anniversary! I love you," he captioned the post.

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Richards has two daughters, Theodora and Alexandra, with Hansen and three other children, Marlon, Angela and late son Tara, with Anita Pallenberg.

Richards is a founding member of the Rolling Stones, which also consists of Mick Jagger and Ronnie Wood.

The band released Hackney Diamonds, its first album of original material since A Bigger Bang (2005), in October.

The Rolling Stones will promote Hackney Diamonds with a new North American stadium tour that kicks off April 28 in Houston.