It's her final release on Warner Bros. Records, so [artist id="1098"]Madonna[/artist] decided to call her upcoming greatest-hits collection Celebration. However, the party got started a little early.

That's because on Wednesday night, the title track from that greatest-hits comp leaked to file-sharing sites across the Net.

"Celebration" is a sleek and slippery dance track that harkens back to Madge's early-'90s, "Vogue"/"Deeper and Deeper" heyday: "You wanna dance?" she coos over a pumping House beat. "I guess I just don't recognize you with your clothes on." The track was produced by legendary DJ Paul Oakenfold and is one of two new songs on the album, which is due in stores September 29.

At press time, MTV News' attempts to reach Madonna's spokesperson for comment on the leak were unsuccessful.

The song was scheduled to hit radio on August 3. According to a Warner Bros. press release, a video for the song was recently shot in Milan and was directed by longtime collaborator Jonas Akerlund, who helmed her "Ray of Light" clip as well as working on the documentary "I'm Going to Tell You a Secret," which followed Madonna on her [article id="1487434"]2004 Re-Invention Tour,[/article] and a television special on her 2006 Confessions Tour.

The second song on Celebration is reportedly a collaboration with Lil Wayne called "Revolver,"

a Weezy-less demo version of which has been making the rounds on YouTube since May.

Celebration will include hits from Madonna's entire Warner Bros. career -- in 2007, she left the label to sign a lucrative, all-encompassing [article id="1572042"]deal with concert titan Live Nation[/article] -- and although a full tracklist is yet to be announced, Warner's press release mentions songs like "Everybody," "Express Yourself," Vogue" and "4 Minutes" as making the cut.

The album will be released in a variety of formats, including a single disc, a deluxe two-CD set, and as a DVD, which will feature some of Madonna's best-known videos, including some never before available on DVD.