04/09/2013 09:41 am ET

'Mary Tyler Moore' Theme Song: Betty White, Valerie Harper, Cloris Leachman And More Sing (VIDEO)

"The Mary Tyler Moore Show" theme song has never sounded as adorable as it did when Mary Tyler Moore, Valerie Harper, Cloris Leachman, Georgia Engel, Jane Leeves, Wendie Malick, Valerie Bertinelli and Betty White sang it with Katie Couric.

Couric was on the set of "Hot In Cleveland" for the TV Land sitcom's "Mary Tyler Moore" reunion and chatted with the stars about everything from aging to Valerie Harper's terminal cancer.

The "Katie" interview ended with an off-key -- yet still wonderful -- rendition of the famous sitcom theme song.

For more adorableness, tune in for "Hot In Cleveland's" "Mary Tyler Moore Show" reunion episode, which is set to air in September.

"Katie" airs weekdays, 3 p.m. ET on ABC.

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