'I'll miss you Mair': Valerie Harper, 77, takes to Twitter and posts emotional tribute to co-star Mary Tyler Moore

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Valerie Harper took to social media on Thursday to remember her beloved late co-star Mary Tyler Moore.

The 77-year-old actress co-starred with Moore who died on Wednesday aged 80 from 1970 to 1974 on The Mary Tyler Moore Show on CBS.

'To The World I'll miss you "Mair." I will always be your co-pilot. I will always love you, darling Mary Tyler Moore,' Harper tweeted to her more than 51,000 followers on Twitter. 

Paying tribute: Valerie Harper, shown with Mary Tyler Moore in 2000, took to social media on Thursday to pay tribute to the actress following her death aged 80

Harper on the show played brash New Yorker Rhoda Morgenstern who became the neighbor of Moore's character Mary Richards in the same Minneapolis building.

Their characters became fast friends despite their differences and Harper later gained her own spin-off Rhoda that aired from 1974 to 1978.

Harper also released a statement to People about Moore's death.

'Last week, to prepare me, I was kindly warned by Mary Tyler Moore’s dear husband, Dr. Robert Levine, that she was in the very last stages of life,' the statement said. 

Social media: The Rhoda star took to Twitter to pay public tribute to Moore

Series stars: Harper and Moore are shown in a 1970s still from The Mary Tyler Moore Show

'But still I cannot stop the emotions I’m experiencing, since she was my acting colleague, my sister/soulmate, and above all, ONE HELL OF A GIRLFRIEND!

She added: 'Working together we knew each other so well we could anticipate each other’s moods, ever ready to engage and KNOW there would be an appropriate response from Mary.'

'I will always feel privileged and honored with the amount of quality time I was able to spend with Mary,' Harper said. 

Best friends: Moore is shown as Mary Richards in a still from The MTM Show with Harper as her brash neighbor Rhoda Morgenstern

'I’ll miss you ''Mair.'' I will always be your co-pilot. I will always love you, darling Mary Tyler Moore,' she wrote mirroring her tweet.

Betty White, 95, also took to social media to pay tribute to More.

White played Sue Ann Nivens alongside Moore from 1973 to 1977 on The Mary Tyler Moore Show.

She took to Twitter and posted a 1970s photo of herself with Moore, Moore's ex-husband Grant Tinker and White's late husband Allen Ludden. 

Best times: Betty White who also starred on The MTM Show took to Twitter to pay tribute to Moore

'Mary Tyler Moore, Grant Tinker, Allen Ludden and I had some of the best times of my life together. She was special,' White wrote for her more than one million followers on Twitter.

White after The Mary Tyler Moore Show later found success again on NBC's The Golden Girls.

Moore gained fame in the 1960s as the frazzled wife Laura Petrie on The Dick Van Dyke Show. 

Critically acclaimed: Ed Asner, White, Moore and the late Ted Knight are shown in May 1976 at the Primetime Emmy Awards in Los Angeles

She created one of TV's first career-woman sitcom heroines in the 1970s with The Mary Tyler Moore Show.

Moore won seven Emmy awards over the years and was nominated for an Oscar for her playing an affluent mother whose son is accidentally killed in the 1980 movie Ordinary People.

The Mary Tyler Moore show ran for seven seasons and won 29 Emmys - a record that stood for 25 years until Frasier broke it in 2002. 

Funny ladies: Moore and White are shown in August 2008 at an event honoring White in Los Angeles

The Mary Tyler Moore Show was the first in a series of acclaimed, award-winning shows she produced with her second husband, Grant Tinker, who died in 2016, through their MTM Enterprises.

The Bob Newhart Show, Hill Street Blues, St. Elsewhere and WKRP in Cincinnati are among the MTM series that followed.

Moore's co-workers since learning about her death have been honoring the leading lady. 

The cast: Harper, Asner, Cloris Leachman, Gavin McLeod, Moore and Knight are shown in a 1972 promotional photo for The MTM Show

CBS comedy: Knight, Moore, Georgia Engel and White are shown in a still

Leading ladies: Leachman, Moore and Harper starred in the show produced by MTM Enterprises, Inc

'She was an impressive person and a talented person and a beautiful person. A force of nature," said producer, creator and director Carl Reiner, who created the The Dick Van Dyke Show.

'She'll last forever, as long as there's television. Year after year, we'll see her face in front of us,' Reiner told The Associated Press.

Ed Asner, 87, who played newsman Lou Grant on The Mary Tyler Moore Show also took to Twitter to remember Moore.

'A great lady I loved and owe so much to has left us. I will miss her. I will never be able to repay her for the blessings that she gave me,' Asner tweeted. 

Spin-off: Harper is shown in a 1975 still from the spin-off Rhoda

TV star: White is shown in a 1985 still from The Golden Girls