Big things are going down at Churchill Downs on Saturday — and not just the 148th Kentucky Derby.

Louisville rapper Jack Harlow is on site filming a music video for his new song, “Churchill Downs.” Rap superstar Drake, who is featured on the track, will join Harlow this afternoon in the infield for the shoot, according to a producer behind the video.

The song is in Harlow’s second studio album, “Come Home The Kids Miss You,” which was released Friday and boasts several big-name features, including Lil Wayne, Pharrell and Justin Timberlake.

Looking dapper in an iridescent white suit, Harlow took to the Derby red carpet Saturday with his parents and friends, including Louisville rappers The Homies.