Brody Jenner has broken up with model Bryana Holly, his girlfriend of about four months, reported Monday.

"It just fizzled," an insider told the magazine.

Jenner is known for his appearances on TV's "The Hills" and "Keeping Up with the Kardashians," the latter of which stars his father, Bruce Jenner; step-mother, Kris Jenner; half-sisters Kylie Jenner and Kendall Jenner; and step-sisters Khloe Kardashian, Kim Kardashian and Kourtney Kardashian.