Justin Timberlake already had a pretty epic Sunday (February 10) under his belt, what with his triumphant Grammy performance and hitting the Hollywood Palladium for an after-show concert. But then he went and topped himself, releasing the new song "Mirrors" from his upcoming third album, The 20/20 Experience, a plaintive, self-reflective track that appears to get pretty personal.

In the new song, Timberlake sings to a paramour about coming to the realization that she's his "other half." It's unclear how autobiographical the track is, but the singer/songwriter does reference taking a break from the relationship, just like he did with his now-wife, Jessica Biel. "It was easy coming back to you/ Once I figured it out, you were right here all along," he sings on the chorus. "It's like you're my mirror, my mirror staring back at me/ I couldn't get any bigger/ With anyone else beside of me."

The song lasts a staggering eight-plus minutes. If "Mirrors" becomes a radio single, it's likely to get edited down, similar to the lengthy FutureSex/LoveSounds songs "LoveStoned/I Think She Knows" and "What Goes Around ... Comes Around."

After the Grammy telecast wrapped, Justin's team tweeted about "Mirrors" hitting the Web. "See Justin's Grammy performance? Preorder The 20/20 Experience on iTunes + download the new song Mirrors! -teamJT."

Justin Timberlake Takes Grammy Selfies In A Suit And Tie

Timberlake released the full 20/20 Experience track list and cover art last week, which listed "Mirrors" as the album's penultimate song. So far, fans have gotten a taste of lead single "Suit & Tie," his other Grammy song "Pusher Love Girl" and a third track he debuted at a Super Bowl charity party, "That Girl."

Some lucky fans might get to hear a few more 20/20 songs Sunday night at JT's Palladium show. Justin posted an Instagram photo of the Palladium marquee boasting the sold-out show with the caption: "This is gonna be fun.. #JTGrammys."

The 20/20 Experience arrives March 19.

What do you think of "Mirrors"? Let us know in the comments!