The 2013 hit talks about support for gay rights — and won MTV's VMA for Best Video with a Message. (Via YouTube / Ryan Lewis)

Details about the rumored performance have not been revealed, but the material girl hinted about the act on social media last week — saying "My lips are almost sealed! I can't say anything more … #itsasecret." (Via Facebook / Madonna)

Madonna's last Grammy performance was in 2006 with Gorillaz singing a mashup of "Feel Good Inc." and "Hung Up."

This will be the first Grammy performance for Macklemore & Ryan Lewis, who gained prominence in 2013 after the release of their album "The Heist." (Via TBS / "Conan")

The Grammys air 8 p.m. Eastern Sunday.

- See more at Newsy.com