Jamie Foxx — Rides Bruce Jenner’s Nuts

Jamie Foxx killed with Bruce Jenner transition jokes at the iHeart Radio Composition Awards.

Foxx hosted the award show Sunday night in L.A. … and in his opening monologue he teased the upcoming musical acts, saying Bruce Jenner would be performing — “He’s doing a his and her duet all by himself.”

The jab scored big laughs — Chris Brown was particularly amused — and Jamie went back for more … hitting Bruce right in the family jewels for his next punchline.

Watch the video … Jamie’s jokes were hardly groundbreaking — lots of comedians have been using Bruce for material — still … arguably insensitive.