Don't forget to say: Superstar!" Mary Katherine exclaimed while striking her signature pose. "Thank you, Mamala." Watch the full video featuring Harris and Shannon as Mary Katherine Gallagher above.

So she enlisted Shannon to revive Mary Katherine Gallagher in a nod to the dinner benefit that raised money for the Al Smith Foundation. Smith was the first Catholic presidential nominee in 1928.

Mary Katherine responded by quoting Taylor Swift: "Haters gonna hate, hate, hate. Shake it off!" "Shake it off," Harris concurred. Related: Kamala Harris reacts to Maya Rudolph's SNL impression as ...

But Mary Katherine couldn't leave without saying her catchphrase (which was also the title of her 1999 spinoff movie). "One last thing I want to tell you! Don't forget to say: Superstar!" ...