Britney SpearsBritney Spears has been reportedly taunting Kevin Federline about her relationship with Jonathan “JR” Rotem.

According to In Touch Weekly, Britney called Kevin to see if he’d seen the photographs of her kissing JR last week before bragging about just having had sex with someone. She then went onto mock him over the fact he’s no longer living the lavish lifestyle he enjoyed when the pair were happily married.

An inside source told the magazine: “It was really bad. [Britney] just started pushing his buttons … [Kevin] started screaming at her.”

Rotem is also reportedly the reason that Britney has flown out with Paris Hilton. According to Star magazine, JR was one of the producers of Paris’s debut album released earlier this year and the two dated while working together.

A source told the magazine: “It was nothing serious, just a few hookups. I bet a million dollars that J.R. tried to keep that a secret from Britney. Britney would probably flip out if she knew that he’d romanced Paris first.”